Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
lang cong » dang cong, bang cong, hang cong
cong dan » cong san, cong tan, huong dan
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac
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 hang) or (hang hang)) va lang cong dan ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - ((hanh hang) OR (hang hang)) va lang cong dan ((than cao) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - ((hanh hang) or (hang hang)) va lang cong dan ((than cao) or (than cap))*.