Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
canh trinh » canh tranh, hanh trinh, canh tinh
dung thanh » duong thanh, dong thanh, dang thanh
hoc thieu » toc thieu, hoc hien
vat dung » van dung, viet dung, mat duong
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
va dung » van dung, va duong, va ung

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 ((va dung) OR (vat dung)) dung thanh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - canh trinh ((va dung) OR (vat dung)) dung thanh ((toan cau) OR (toan tap))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - canh trinh ((va dung) OR (vat dung)) dung thanh ((toan cau) or (toan tap))*".