Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
thuoc ma » hoc ma
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
dan cua » dan ca, ban cua, dai cua
duoc ma » duoc lam
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) OR (duoc ma)) doanh dan 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) OR (duoc ma)) doanh dan 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) OR (duoc ma)) doanh dan cua tre*".