Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
hanh lai » hanh lam, hanh tai, thanh lap
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. ((hieu van) or (lieu va)) ((cac duc) or (cac dac)) va hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. ((hieu van) OR (lieu va)) ((cac duc) OR (cac dac)) va hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. ((hieu van) or (lieu va)) ((cac duc) or (cac dac)) va hanh lai cua viet*.