Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
phuong van » phung van, phong van, phuong lan
anh nhan » danh nhan, doanh nhan, thanh nhan
nhan cua » nhat cua, nhan luc, nhan su
cua bang » chua bang, cua ban, cua dang
van toan » van tuan, van tan, van thanh
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 quang)) - anh nhan cua bang phuong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu quang)) - anh nhan cua bang phuong van toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu quang)) - anh nhan cua bang phuong van toan cau*.