Perhaps you should try some spelling variations:
thien dang » thien bang, thien danh, thien nang
hoc thien » hoc hien, hoc thieu, hoc thiet
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cong tran » cong tan, cong tuan, cong toan
thanh lap » thanh san, thanh hai, thanh van
tang cua » mang cua, hang cua, tang luan
phan lap » phan dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien dang - thanh ((tang cua) OR (trung cua)) dung cong tran ((thanh lap) OR (phan lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien dang - thanh ((tang cua) or (trung cua)) dung cong tran ((thanh lap) OR (phan lap))~".
• Adding a wildcard symbol may retrieve word variants: hoc thien dang - thanh ((tang cua) or (trung cua)) dung cong tran ((thanh lap) OR (phan lap))*.