Perhaps you should try some spelling variations:
chieu quan » hieu quan, thieu quang, hieu qua
nang cong » nang song, dang cong, bang cong
ho chieu » theo chieu, hoc thieu, doi chieu
tang van » dang van, hoang van, trong van
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
tang va » trang va, thang va, tang vat

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 quan - hanh ((tang va) or (tang van)) nang cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu quan - hanh ((tang va) OR (tang van)) nang cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu quan - hanh ((tang va) or (tang van)) nang cong dan toan cau*.