Perhaps you should try some spelling variations:
thuyet tinh » thuyet trinh, thuyet kinh, thuyet dinh
hoc thuyet » hoc chuyen
tung quang » tuong quang, hung quang, vung quang
dung quang » dang quang, dung quan, luong quang
trong tan » trong quan, trong cac, trong ca
tan toan » tan tran, tap toan, van 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 thuyet tinh - thanh ((tung quang) OR (dung quang)) dung trong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thuyet tinh - thanh ((tung quang) OR (dung quang)) dung trong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thuyet tinh - thanh ((tung quang) OR (dung quang)) dung trong tan toan cao*.