Perhaps you should try some spelling variations:
tren quang » trien quang, tran quang, tien quang
thanh tung » thanh cong
hoc tren » moc tren, hoc truyen, thuoc tren
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan tap » toan ban
va bang » va nang, va ban, va hang
va lang » va nang, hoa lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tren quang - thanh tung ((va bang) or (va lang)) cong tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tren quang - thanh tung ((va bang) OR (va lang)) cong tac toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc tren quang - thanh tung ((va bang) or (va lang)) cong tac toan tap*.