Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tieu sang » chieu sang, tieu dung, tiem nang
cong hach » cong sach, cong khanh, trong hach
anh tang » anh bang, anh dang, anh nang
toan cau » toan cao, toan ban, toan tap
tang va » trang va, tang van, thang va
va nang » van nang, da nang, cam nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tieu sang) or (tin dung)) - anh tang va nang ((cong hach) OR (cong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sang) OR (tin dung)) - anh tang va nang ((cong hach) OR (cong thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sang) or (tin dung)) - anh tang va nang ((cong hach) OR (cong thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sang) or (tin dung)) - anh tang va nang ((cong hach) OR (cong thanh)) toan cau*.