Perhaps you should try some spelling variations:
trong nghien » truong nghien, tron nghien, trong nhien
trai nghiem » trac nghiem, thi nghiem
hanh trong » hanh trang, anh trong, hinh trong
nghien hau » nghien cuu, nghiep ha, nghiep cau
kham trai » khac trai, khach trai, pham tai
tu hanh » du hanh, lu hanh, thuc 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 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 trong nghien hau hoc ) OR ( vu kham trai nghiem _ hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trong nghien hau hoc ) or ( vu kham trai nghiem _ hoc ))*.