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
dang cong » dung cong
tam dang » nam dang, tam dan, tran dang
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » 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 tinh) or (chieu sang)) - hanh trung tam dang cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (chieu sang)) - hanh trung tam dang cong tam toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (chieu sang)) - hanh trung tam dang cong tam toan cau*.