Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, trinh thiet, trinh dien
nghiem duoc » nghiem thuoc, nghe duoc
canh trinh » canh tranh, hanh trinh, canh tinh
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien du » nghiep du, nghien cuu, nghiem dau
thu canh » thuc hanh, thu cong, thu ban
duoc hoc » quoc hoi
du hoc » tu hoc
kinh » dinh, minh

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

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