Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh han
hien xanh » hien hanh, hien nhanh, chieu xanh
lang cong » dang cong, bang cong, hang cong
trinh va » trinh van, trinh vat, trinh ve
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 toan)) lang 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 toan)) lang cong dan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trinh va) or (trinh toan)) lang cong dan toan cao*.