Perhaps you should try some spelling variations:
thien van » thi van
hau truc » cau truc, hang truc, hoc truc
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, te sach, tu cach
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
van hau » van ha, van hai, van dau
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
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: ((tu sach) or (((su sach) OR (so sach)))) ky nang xa hoi. thien van hau truc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (so sach)))) ky nang xa hoi. thien van hau truc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((su sach) OR (so sach)))) ky nang xa hoi. thien van hau truc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) OR (so sach)))) ky nang xa hoi. thien van hau truc va hanh dai cua tre*.