Perhaps you should try some spelling variations:
hien manh » hien hanh, hieu manh, hien nhanh
tien manh » tien anh, tien thanh, tieng anh
tranh qua » tranh cua, trinh qua, tranh quang
thanh qua » thanh quan, thanh qui, hanh qua
trong nu » trong su, trong tu, trong nuoc
than cao » toan cao, thai cao, than cap
nu than » su thanh, vu thanh

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 manh) OR (tien manh)) - canh ((tranh qua) or (thanh qua)) dung trong nu than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (tien manh)) - canh ((tranh qua) OR (thanh qua)) dung trong nu than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (tien manh)) - canh ((tranh qua) or (thanh qua)) dung trong nu than cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (tien manh)) - canh ((tranh qua) or (thanh qua)) dung trong nu than cao*.