Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » canh tranh, hanh chinh
bach tranh » sach tranh, canh tranh, bac thanh
nghien tu » nghiep tu, nghien cuu, nghiep vu
nghiem _ » nghiem d, nghiem y, nghiem va
nghiem h » nghiem d, nghiem y, nghiem hoa
co hanh » co thanh, co phanh, co anh
tu hoc » te hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( co hanh trinh nghien tu hoc ) OR ( vu bach tranh ((nghiem _) OR (nghiem h)) hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( co hanh trinh nghien tu hoc ) or ( vu bach tranh ((nghiem _) or (nghiem h)) hoc ))*.