Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trung dam » trung tam, trung dai, trung nam
trong dam » trong lam, trong nam, trong cac
than cap » khan cap, thanh lap, thanh cac
khan ap » khan cap, han ap, khan dam

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 ((trung dam) OR (trong dam)) nhung huong dan ((than cap) or (khan ap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trung dam) OR (trong dam)) nhung huong dan ((than cap) OR (khan ap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - hanh ((trung dam) OR (trong dam)) nhung huong dan ((than cap) or (khan ap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh ((trung dam) OR (trong dam)) nhung huong dan ((than cap) or (khan ap))*.