Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
nhung cong » dung cong, thong cong, hang cong
trung cam » trung tam, trung cap, trung ca
trung nam » trung tam, trong nam, trung cap
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan cap » khan ap, than cap, khoan cam

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 (chinh sach)) - hanh ((trung cam) or (trung nam)) nhung cong tan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chinh sach)) - hanh ((trung cam) OR (trung nam)) nhung cong tan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) OR (chinh sach)) - hanh ((trung cam) or (trung nam)) nhung cong tan khan cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) OR (chinh sach)) - hanh ((trung cam) or (trung nam)) nhung cong tan khan cap*.