Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trinh nhan » trinh phan, trinh nha, trinh nhap
thuc nhung » phuc nhung, thu nhung, thuc chung
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh han » trinh quan
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu
hang dau » hang va, hang tai

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 - ((trinh nhan) or (trinh han)) thuc nhung cong tan ((phan dau) OR (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((trinh nhan) OR (trinh han)) thuc nhung cong tan ((phan dau) OR (hang dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((trinh nhan) or (trinh han)) thuc nhung cong tan ((phan dau) OR (hang dau))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((trinh nhan) or (trinh han)) thuc nhung cong tan ((phan dau) OR (hang dau))*.