Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
thanh cac » hanh cac, thanh bac, thanh ca
ho chieu » theo chieu, hoc thieu, doi chieu
trung he » trung ha, trong he, trung hieu
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, than cua

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 trung he thong cong tan ((than cap) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh trung he thong cong tan ((than cap) OR (thanh cac)).
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh trung he thong cong tan ((than cap) or (thanh cac))*.