Perhaps you should try some spelling variations:
trien quang » tuyen quang, dien quang, thien quan
phong chong » thong thong
chong tan » cong tan, chong gian, chong tham
ve phong » va phong, van phong, mo phong
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
toan ve » toan va, toan ke, toan von

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((trien quang) or (tran quang)) - tinh toan ve phong chong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((trien quang) OR (tran quang)) - tinh toan ve phong chong tan toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((trien quang) or (tran quang)) - tinh toan ve phong chong tan toan tap*.