Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, thong thong, phong chong
trinh van » trinh han, trinh quan, trinh toan
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sach - canh trinh van ((thong cong) or (tong cong)) dan ((phan lap) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - canh trinh van ((thong cong) OR (tong cong)) dan ((phan lap) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - canh trinh van ((thong cong) or (tong cong)) dan ((phan lap) or (phan dau))*.