Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
quang dung » quang trung, ung dung, cuong dung
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cong tan » cong tac, cong san, cong thanh
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (chieu sach)) - ((thanh trung) or (thanh tung)) quang dung cong tan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (chieu sach)) - ((thanh trung) OR (thanh tung)) quang dung cong tan phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (chieu sach)) - ((thanh trung) or (thanh tung)) quang dung cong tan phan cau*.