Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
trinh han » trinh quan
thuc hang » thuc hanh, thu hang, phuc hang
hang cong » dang cong, hang nong, bang cong
cong than » cong thanh, cong thang, cong tan
than phan » thanh phan, toan phan, thanh pham
han thuc » nhan thuc, phan thuc, dan thuc

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 sach) or (chieu sang)) - trinh han thuc hang cong than phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu sang)) - trinh han thuc hang cong than phan tu.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu sang)) - trinh han thuc hang cong than phan tu*.