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
thong cua » thong quan, thong tu, huong cua
mang cua » manh cua, dung cua, ban cua
cong tac » cong ty
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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