Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, tien anh, thien thanh
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh he, trinh vi, trinh viet
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 nganh) or (thien anh)) - hanh ((trinh va) OR (trinh ve)) nhung cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (thien anh)) - hanh ((trinh va) OR (trinh ve)) nhung cong san than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu nganh) or (thien anh)) - hanh ((trinh va) OR (trinh ve)) nhung cong san than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (thien anh)) - hanh ((trinh va) OR (trinh ve)) nhung cong san than cau*.