Perhaps you should try some spelling variations:
thien van » thi van
cua viet » ca viet, hoa viet, cua vat
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
pham duy » pham duc
cham duc » pham duc, cham soc, phan duc
hieu van » hieu va, lieu va, hieu ve
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tu sach » thu sach, su sach, te sach
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) or (thien van)) ((cham duc) or (pham duy)) van hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. ((hieu van) OR (thien van)) ((cham duc) OR (pham duy)) van hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. ((hieu van) or (thien van)) ((cham duc) or (pham duy)) van hanh dai cua viet*.