Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tran thanh » ban thanh, quan thanh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
van thanh » ban thanh, van tuan
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 thanh) OR (van thanh))~.
• 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 thanh) OR (van thanh)).
• 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 thanh) OR (van thanh))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - thanh ((tung cua) or (trung cua)) nhung cong tan ((tran thanh) OR (van thanh))*.