Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, lieu va
thuoc ma » hoc ma, duoc ma
thi hang » thi hanh, thi nang, thi hong
van lam » van nam
cua tre » cuu tre, cua triet, dua tren
ma hang » mat hang, mua hang, va hang
te sach » toc sach
ty lang » tay lang, ty xang, ty hang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty lang) or (thi hang)) xa hoi. hieu van lam thuoc ma hang va ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (thi hang)) xa hoi. hieu van lam thuoc ma hang va ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) or (thi hang)) xa hoi. hieu van lam thuoc ma hang va ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (thi hang)) xa hoi. hieu van lam thuoc ma hang va ((cua tre) OR (cua te))*.