Perhaps you should try some spelling variations:
doanh dai » doanh tai, doanh dao, doanh giai
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
van lam » van nam
duoc va » nuoc va, duoc ma, duong va
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang xa hoi. hieu van lam ((duoc va) or (duc va)) doanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. hieu van lam ((duoc va) OR (duc va)) doanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. hieu van lam ((duoc va) or (duc va)) doanh dai cua tre*.