Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh trung » thanh tung
cong ngang » cong nhan, cong quang, cong lang
hoc thieu » toc thieu, hoc hien
van dung » van dong, xay dung, tin dung
vat dung » va dung, viet dung, mat duong
cong van » cong vang, cong san, song van
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu quang - thanh trung ((van dung) or (vat dung)) ((cong van) or (cong ngang)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - thanh trung ((van dung) OR (vat dung)) ((cong van) OR (cong ngang)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - thanh trung ((van dung) or (vat dung)) ((cong van) or (cong ngang)) toan cao*.