Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
bang cong » dang cong, bang song, hang cong
cua bang » chua bang, cua ban, cua dang
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: hoc ((chieu sang) or (hieu quang)) - ((hanh trinh) or (thanh trung)) cua bang cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu quang)) - ((hanh trinh) OR (thanh trung)) cua bang cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu quang)) - ((hanh trinh) or (thanh trung)) cua bang cong tap toan cao*.