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

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 ha)) trong cong vang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((tang ha) OR (trung ha)) trong cong vang toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((tang ha) or (trung ha)) trong cong vang toan cao*.