Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
tran tuan » tran quang, tran thanh, tranh luan
tran xuan » tran quang, tran van
tung cua » tuong cua, dung cua, tang cua
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - thanh ((tung cua) or (trung cua)) nhung cong tan ((tran tuan) OR (tran xuan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - thanh ((tung cua) OR (trung cua)) nhung cong tan ((tran tuan) OR (tran xuan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - thanh ((tung cua) or (trung cua)) nhung cong tan ((tran tuan) OR (tran xuan))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - thanh ((tung cua) or (trung cua)) nhung cong tan ((tran tuan) OR (tran xuan))*.