Perhaps you should try some spelling variations:
dung chung » dung cong, dung ung, dung trung
hien manh » hien hanh, tien manh, hieu manh
hanh tang » hanh trang, anh tang, hanh mang
luan dung » lan dung, luan dong, luan hung
chung dan » chung han, hung dan, chung nhan
thanh cac » hanh cac, thanh bac, tranh cac
thanh ca » thanh cha, thanh ha, thanh va

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