Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh ve » trinh he, trinh va, trinh vi
ve nhung » va nhung, tu nhung
tan toan » tan tran, van toan, dan toan
tap toan » tap quan, bai toan
tap doan » tap quan

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 - canh trinh ve nhung cong ((tan toan) or (((tap toan) or (tap doan)))) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - canh trinh ve nhung cong ((tan toan) OR (((tap toan) OR (tap doan)))) tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - canh trinh ve nhung cong ((tan toan) or (((tap toan) or (tap doan)))) tap*.