Perhaps you should try some spelling variations:
tieu sang » chieu sang, tieu dung, tiem nang
cong hach » cong thanh, cong khanh, trong hach
cong sach » ong sach, song sach, duong sach
anh nang » ganh nang, anh bang, anh dang
toan cao » toan ban, toan tap
nang va » nang van, hang va, nang ma
va dang » van dang, va nang, va lang

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