Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
hau thuc » huu thuc, ha thuc, mau thuc
vat hanh » vat thanh, van hanh, va hanh
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (((su sach) or (co sach)))) ky nang xa hoi. thien van hau thuc vat hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (((su sach) OR (co sach)))) ky nang xa hoi. thien van hau thuc vat hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (((su sach) or (co sach)))) ky nang xa hoi. thien van hau thuc vat hanh dai cua tre*.