Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dang hong » dang hoang, dang cong, dang hung
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
hong van » hoang van, thong van, phong van
toan tai » toan tap, doanh tai, toan cao
toan ban » van ban
doi chi » doi khi
va dang » van dang, va nang, va lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (doi chi)) xanh - canh trinh va dang hong van ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (doi chi)) xanh - canh trinh va dang hong van ((toan tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (doi chi)) xanh - canh trinh va dang hong van ((toan tai) or (toan ban))*.