Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
hanh trang » thanh trung, hanh trinh, minh trang
hoc thieu » toc thieu, hoc hien
trong tac » trong cac, tuong tac, trong tan
vat dung » van dung, viet dung, mat duong
va dung » van dung, va duong, va ung
tac van » tac vang, cac van, tac va

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 - ((hanh trang) or (canh tranh)) ((vat dung) OR (va dung)) trong tac van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - ((hanh trang) OR (canh tranh)) ((vat dung) OR (va dung)) trong tac van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - ((hanh trang) or (canh tranh)) ((vat dung) OR (va dung)) trong tac van ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - ((hanh trang) or (canh tranh)) ((vat dung) OR (va dung)) trong tac van ban*.