Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
lam thuoc » nam thuoc, am thuc, cay thuoc
thuoc ma » hoc ma, duoc ma
dang xay » dang van, van xay
hieu van » thien van, lieu va, hieu ve
ma doanh » va doanh, hoa doanh, van doanh
cua tre » cua te, cuu tre, cua triet
van cua » vang cua, ban cua, dan cua
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
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) OR (hieu va)) lam thuoc ma doanh 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) OR (hieu va)) lam thuoc ma doanh 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) OR (hieu va)) lam thuoc ma doanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) or (tu cac)) ky dang xay hoi. ((hieu van) OR (hieu va)) lam thuoc ma doanh van cua tre*.