Perhaps you should try some spelling variations:
thien van » thi van
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
van lam » van nam
cai hoi » cau hoi, dai hoi, cai hoa
ty nang » ky nang, ty hang, ly nang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) or (ty xang)) cai hoi. thien van lam ((luc va) or (tuc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) cai hoi. thien van lam ((luc va) OR (tuc va)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) cai hoi. thien van lam ((luc va) or (tuc va)) hanh dai cua tre*.