Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
nghiem duoc » nghiem thuoc, nghe duoc
thi nghiem » thuc nghiem
canh trinh » canh tranh, hanh trinh, canh tinh
sach thi » sach thu, sach tai, sach thieu
duoc hoc » quoc hoi
su sach » so sach, vu sach
ve canh » van canh, ve thanh
dan hoc » van hoc, dan toc, toan hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach thi nghiem duoc hoc ) or ( ve canh trinh nghien ((dan hoc) or (dai hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach thi nghiem duoc hoc ) OR ( ve canh trinh nghien ((dan hoc) OR (dai hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( su sach thi nghiem duoc hoc ) or ( ve canh trinh nghien ((dan hoc) or (dai hoc)) ))*.