Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh dung » thanh duong, thanh tung, thanh hung
nhung cong » dung cong, thong cong, hang cong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong san, cong thanh
tran tap » toan tap, tran tuan, trang tai
tran tan » tran tuan, tran van, tran thanh

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 - thanh dung va nhung cong tan ((tran tap) OR (tran tan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh dung va nhung cong tan ((tran tap) OR (tran tan))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh dung va nhung cong tan ((tran tap) OR (tran tan))*.