Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
doan van » doan va, hoang van, tran van
nang xa » lang xa, nang ma, mang xa
van lam » van nam
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
luan » quan, lan

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) or (nang x)) hoi. hieu van lam duoc va ((doan van) OR (luan van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (nang x)) hoi. hieu van lam duoc va ((doan van) OR (luan van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (nang x)) hoi. hieu van lam duoc va ((doan van) OR (luan van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (nang x)) hoi. hieu van lam duoc va ((doan van) OR (luan van)) cua tre*.