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
tuong cua » truong cua, huong cua, thong cua
dung cua » dung luan, dung cho
tac than » tac thanh, tam than, bac thanh
tac nhan » tao nhan, cac nhan, dac nhan

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 ((tuong cua) or (dung cua)) nhung cong ((tac than) OR (tac nhan)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - thanh ((tuong cua) OR (dung cua)) nhung cong ((tac than) OR (tac nhan)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - thanh ((tuong cua) or (dung cua)) nhung cong ((tac than) OR (tac nhan)) cap".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - thanh ((tuong cua) or (dung cua)) nhung cong ((tac than) OR (tac nhan)) cap*.