Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
pham duy » pham duc
duy xanh » duy anh, duy ranh, duy khanh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
x hoi » xa hoi, o hoi, 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 (x ho)). hieu van pham 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 (x ho)). hieu van pham duy xanh hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) OR (x ho)). hieu van pham duy xanh hanh lai ca viet*.