Perhaps you should try some spelling variations:
thong quang » thong quan, thong qua, luong quang
trong quan » thong quan, tong quan, luong quan
trong san » trong cac, cong san, dong san
cua tinh » va tinh, ha tinh, hoa tinh
cua sinh » hoa sinh, va sinh
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((cua tinh) or (cua sinh)) - anh ((trong quan) OR (thong quang)) dung trong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((cua tinh) OR (cua sinh)) - anh ((trong quan) OR (thong quang)) dung trong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((cua tinh) or (cua sinh)) - anh ((trong quan) OR (thong quang)) dung trong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((cua tinh) or (cua sinh)) - anh ((trong quan) OR (thong quang)) dung trong san toan cao*.