Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, trinh thiet
nghiem thuoc » nghiem duoc, nghiem hoa, nghi thuc
trinh dien » tinh dien, trinh tin
thuoc sach » hoc sach, nuoc sach, thuat sach
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
thu canh » thuc hanh, thu cong, thu ban
du hoc » tu hoc, duoc 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) OR (trinh dien)) du hoc ) or ( thuoc sach kinh nghiem thuoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu canh ((trinh nghien) OR (trinh dien)) du hoc ) OR ( thuoc sach kinh nghiem thuoc hoc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu canh ((trinh nghien) OR (trinh dien)) du hoc ) or ( thuoc sach kinh nghiem thuoc hoc ))*".