Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
cach trinh » hanh trinh, sach tranh, cac tinh
nghien dau » nghiem dau, nghiep dau, nghien cuu
cac tranh » cac thanh, can tranh, canh tranh
nghiem te » nghiem de, nghiem ve, nghiem tien
nghiem d » nghiem de, nghiem _, nghiem h
tu cach » tu cac
dau hoc » dai hoc, du hoc, dan hoc
hoc cac » hoc cao

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

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