Perhaps you should try some spelling variations:
hien manh » hien hanh, hieu manh, hien nhanh
tien manh » tien anh, tien thanh, tieng anh
hanh hang » thanh hang, hang hang, hanh han
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
manh toan » thanh toan, anh tuan, tinh toan
toan cao » toan ban, toan tap

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)) - hanh hang va ((bang cong) or (dang cong)) manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (tien manh)) - hanh hang va ((bang cong) OR (dang cong)) manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (tien manh)) - hanh hang va ((bang cong) or (dang cong)) manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) OR (tien manh)) - hanh hang va ((bang cong) or (dang cong)) manh toan cao*.