Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hang mang » hang hang, hang mong, hanh mang
cua nhung » va nhung
mang cua » manh cua, dung cua, ban cua
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: theo ((chieu sach) or (hieu lang)) - hang mang cua nhung cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - hang mang cua nhung cong tam toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu lang)) - hang mang cua nhung cong tam toan cau*.