Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
tuong cua » truong cua, huong cua, thong cua
hoc hieu » hoc thieu, hoc hien, doc hieu
tung cua » trung cua, dung cua, tang cua
chan cau » phan cau, can cau, chinh cau
con ban » con bang, co ban, coc ban
can ban » van ban, 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 hieu quang - thanh ((tung cua) or (tuong cua)) thuong ((con ban) OR (can ban)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu quang - thanh ((tung cua) OR (tuong cua)) thuong ((con ban) OR (can ban)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - thanh ((tung cua) or (tuong cua)) thuong ((con ban) OR (can ban)) chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - thanh ((tung cua) or (tuong cua)) thuong ((con ban) OR (can ban)) chan cau*.