Perhaps you should try some spelling variations:
quan trong » gian trong
tieu tinh » trieu tinh, tieu trinh, lieu tinh
manh dung » manh hung, manh tung, anh dung
dung quan » dung quang, dung luan, luong quan
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai 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: theo tieu tinh - manh dung quan trong cong tap toan cao~.
• Adding a wildcard symbol may retrieve word variants: theo tieu tinh - manh dung quan trong cong tap toan cao*.