Perhaps you should try some spelling variations:
doi chieu » doc hieu, mot chieu, ho chieu
trong bai » trong ban, thong bai, trong hai
anh quan » anh tuan, ban quan, anh quoc
anh nhan » danh nhan, doanh nhan, thanh nhan
tan dung » tran dung, tin dung, van dung
bai toan » bai tap
toan tap » toan ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doi chi)) sang - ((anh quan) or (anh nhan)) tan dung trong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sang - ((anh quan) OR (anh nhan)) tan dung trong bai toan tap.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sang - ((anh quan) or (anh nhan)) tan dung trong bai toan tap*.