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
cong tam » cong tac, cong tan, cong nam
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
bac cua » ban cua, bai cua, bao cua
tac cua » tac quan, thuc cua

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 - tinh ((bac cua) or (tac cua)) nhung cong tam ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - tinh ((bac cua) OR (tac cua)) nhung cong tam ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - tinh ((bac cua) or (tac cua)) nhung cong tam ((toan cau) or (toan cao))*.