Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
duy xanh » duy anh, duy ranh, duy khanh
phan duy » pham duy, phan huy, phan duc
van phan » van phong, van thanh, luan phan
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa
x hoi » xa hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((x hoi) or (((o hoi) OR (o hai)))). hieu van phan duy xanh hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (((o hoi) OR (o hai)))). hieu van phan duy xanh hanh lai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) or (((o hoi) OR (o hai)))). hieu van phan duy xanh hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) or (((o hoi) OR (o hai)))). hieu van phan duy xanh hanh lai ca viet*.