Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh van » trinh han, trinh quan, trinh toan
bang cong » dang cong, bang song, hang cong
trinh va » trinh vat, trinh ve, trinh vi
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh ((trinh va) or (trinh van)) bang cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trinh va) OR (trinh van)) bang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh va) or (trinh van)) bang cong dan toan cao*.