Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thanh tung » thanh cong
hien xanh » hien hanh, hien nhanh, chieu xanh
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap
va hang » van hang, va nang, va hanh
va lang » va nang, hoa lang

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) or (thanh tung)) ((va hang) OR (va lang)) cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh trinh) OR (thanh tung)) ((va hang) OR (va lang)) cong dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - ((hanh trinh) or (thanh tung)) ((va hang) OR (va lang)) cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh trinh) or (thanh tung)) ((va hang) OR (va lang)) cong dan than cao*.