Perhaps you should try some spelling variations:
trong nghien » truong nghien, tron nghien, trong nhien
trai nghiem » trac nghiem, thi nghiem
nghien hau » nghien cuu, nghiep ha, nghiep cau
kham trai » khac trai, khach trai, pham tai
tu hanh » du hanh, thuc hanh, thi hanh
lu hanh » luu hanh, du hanh, ly hanh
hau hoc » phau hoc, hau loc, cau hoc
vu kham » vu khanh

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