Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
cham duc » cham soc, pham duy, phan duc
hanh lai » hanh lam, thanh lap, thanh loi
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

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. hieu van ((cham duc) OR (pham duc)) va ((hanh lai) or (hanh tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu van ((cham duc) OR (pham duc)) va ((hanh lai) OR (hanh tai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu van ((cham duc) OR (pham duc)) va ((hanh lai) or (hanh tai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu van ((cham duc) OR (pham duc)) va ((hanh lai) or (hanh tai)) cua viet*.