Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hanh trinh » canh tranh, hanh chinh
luat thong » luat thuong, suat thong, luat trong
xuat thong » xuat thuong, suat thong, luat thuong
hieu manh » chieu xanh, dieu hanh, hien hanh
cong van » cong vang, cong san, song van
van tay » van tai, van tan, van tam
tay cao » tao cao, tay co, toan cao

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 trinh ((luat thong) OR (xuat thong)) cong van tay cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh trinh ((luat thong) OR (xuat thong)) cong van tay cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - hanh trinh ((luat thong) OR (xuat thong)) cong van tay cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - hanh trinh ((luat thong) OR (xuat thong)) cong van tay cao*.