Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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