Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
trung cao » truong cao, trung co, trung ca
trung cap » truong cao, trung tam
dang cong » dung cong
van thanh » ban thanh, van tuan
thanh tap » thanh lap, thanh tai, thanh tay
cong van » cong vang, cong san, song van

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