Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
anh truong » manh truong, anh thuong, anh trong
nhung cong » dung cong, thong cong, hang cong
truong va » truong dai, truong cao, truong dao
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu quang - anh truong va nhung cong ((tac toan) or (tam toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu quang - anh truong va nhung cong ((tac toan) OR (tam toan)) cao.
• Adding a wildcard symbol may retrieve word variants: toc thieu quang - anh truong va nhung cong ((tac toan) or (tam toan)) cao*.