Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh hinh » hanh chinh, hanh tinh, hanh dinh
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong san » cong tac
san toan » van toan, dan toan, 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 hinh ((cua dung) OR (qua dung)) cong san toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh hinh ((cua dung) OR (qua dung)) cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh hinh ((cua dung) OR (qua dung)) cong san toan cao*.