Perhaps you should try some spelling variations:
doanh van » doanh va, doanh ban, doanh nhan
lam thuoc » nam thuoc, am thuc, cay thuoc
thuoc ma » hoc ma, duoc ma
doan van » doan va, hoang van, luan van
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
van lam » van nam
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
te cac » ve cac, te cao, de cac

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

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