Perhaps you should try some spelling variations:
trong nghien » truong nghien, trong nhien, trinh nghien
tron nghien » tro nghien, truong nghien, trinh nghien
trai nghiem » trac nghiem, thi nghiem
tu hanh » du hanh, lu hanh, thuc hanh
hau hoc » phau hoc, hau loc, cau hoc
vu khac » vu kham, vu khanh, bui khac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu hanh ((trong nghien) OR (tron nghien)) hau hoc ) or ( vu khac trai nghiem _ hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh ((trong nghien) OR (tron nghien)) hau hoc ) OR ( vu khac trai nghiem _ hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu hanh ((trong nghien) OR (tron nghien)) hau hoc ) or ( vu khac trai nghiem _ hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu hanh ((trong nghien) OR (tron nghien)) hau hoc ) or ( vu khac trai nghiem _ hoc ))*.