Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, nhung don
hien hanh » dieu hanh
trang cua » tranh cua, tang cua, trung cua
hang cong » dang cong, hang nong, bang cong
tan han » tan nhan, tran han, tan van
han tu » phan tu, hanh tu, ban tu

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 nhanh) or (hien hanh)) - hanh trang cua ((nhung cong) OR (hang cong)) tan han tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (hien hanh)) - hanh trang cua ((nhung cong) OR (hang cong)) tan han tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (hien hanh)) - hanh trang cua ((nhung cong) OR (hang cong)) tan han tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (hien hanh)) - hanh trang cua ((nhung cong) OR (hang cong)) tan han tu*.