Perhaps you should try some spelling variations:
lam duoc » nam duoc, luat duoc, lam thuoc
thanh ha » thanh hoa, thanh hai, nhanh ha
thanh ca » thanh cha, thanh cac, thanh va
hieu van » hieu va, thien van, lieu va
duoc va » nuoc va, duc va, duoc ma
sach ky » sac ky, sach ty, sach kem
van lam » van nam
nang xa » nang x, lang xa, nang ma
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duoc va ((thanh ca) or (thanh ha)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duoc va ((thanh ca) OR (thanh ha)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duoc va ((thanh ca) or (thanh ha)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: co ((sach ky) OR (sach y)) nang xa hoi. hieu van lam duoc va ((thanh ca) or (thanh ha)) cuu tre*.