Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
tran hoang » tran hong, quan hoang, tran quang
hieu manh » chieu xanh, dieu hanh, hien hanh
hoang van » hang va
cong sang » cong san, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
van dang » van dong, van dung, van nang
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)) - tran hoang van dang ((cong sang) OR (cong lang)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - tran hoang van dang ((cong sang) OR (cong lang)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (hieu nganh)) - tran hoang van dang ((cong sang) OR (cong lang)) than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hieu nganh)) - tran hoang van dang ((cong sang) OR (cong lang)) than cau*.