Perhaps you should try some spelling variations:
trinh thuat » trinh thiet, trinh thuc, trinh chat
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hung duong » hung vuong, hung cuong, hung luong
hieu manh » chieu xanh, dieu hanh, hien hanh
duong tan » duong tuan, duong van, duong tai
tan than » tan thanh, tan tran, 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 (hieu nganh)) - hanh ((trinh thuat) OR (trinh luat)) hung duong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - hanh ((trinh thuat) OR (trinh luat)) hung duong tan than cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - hanh ((trinh thuat) OR (trinh luat)) hung duong tan than cau*".