Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trung » thanh trung, hanh trang, manh trung
huong manh » duong manh, hung manh, luong manh
tuan dung » tuan duong, tran dung, tuan dang
manh toan » thanh toan, anh tuan, tinh toan
tan dung » tran dung, tin dung, van dung
toan ban » van ban

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 tinh) or (chieu sang)) - hanh trung ((tuan dung) OR (tan dung)) huong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (chieu sang)) - hanh trung ((tuan dung) OR (tan dung)) huong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (chieu sang)) - hanh trung ((tuan dung) OR (tan dung)) huong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (chieu sang)) - hanh trung ((tuan dung) OR (tan dung)) huong manh toan ban*.