Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung hoc » trung quoc
ho chieu » theo chieu, hoc thieu, doi chieu
cong van » cong vang, cong san, song van
toan cao » toan tap
toan ban » van ban
tang ha » lang ha, tang ma, trung ha

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