Perhaps you should try some spelling variations:
cong duong » cuong duong, cong dong, con duong
duong manh » duong van
hien manh » hien hanh, tien manh, hieu manh
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
luan cong » luat cong, luong cong, luan chung
manh toan » thanh toan, anh tuan, tinh toan
toan ban » van ban

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 (hanh mang)) luan cong duong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - ((hanh tang) OR (hanh mang)) luan cong duong manh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - ((hanh tang) or (hanh mang)) luan cong duong manh toan ban*.