Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hanh trung » thanh trung, hanh trang, manh trung
thanh tung » thanh cong
hieu manh » chieu xanh, dieu hanh, hien hanh
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
qua dung » quang dung, su dung, qua song
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 ((hieu manh) OR (hieu nganh)) - ((hanh trung) or (thanh tung)) qua dung cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - ((hanh trung) OR (thanh tung)) qua dung cong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - ((hanh trung) or (thanh tung)) qua dung cong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - ((hanh trung) or (thanh tung)) qua dung cong manh toan cao*.