Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
nhung dung » phuong dung, ung dung, thong dung
hoc thieu » toc thieu, hoc hien
dung manh » duong manh, dung danh, hung manh
trung va » truong va, trang va, trung tam
trung ha » trung hoc, trung tam, trung cap
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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 va) or (trung ha)) nhung dung manh ((toan cau) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu quang - thanh ((trung va) OR (trung ha)) nhung dung manh ((toan cau) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu quang - thanh ((trung va) or (trung ha)) nhung dung manh ((toan cau) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu quang - thanh ((trung va) or (trung ha)) nhung dung manh ((toan cau) OR (toan tap))*.