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 vu » nghiep vu, nghien cuu, nghiep vua
nghiem d » nghiem de, nghiem do, nghiem _
nghiem h » nghiem _, nghiem y, nghiem hoa
co hanh » co thanh, co phanh, co anh
vu hoc » tu hoc, va hoc, du hoc

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

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