Perhaps you should try some spelling variations:
trinh dien » tinh dien, trinh tin
kinh nghe » tinh nghe, vinh nghe, kinh nghiem
thu sach » thuat sach, thuoc sach, thu hoach
nghe duc » nghe duoc, nghe thuc, nghe dung
dien duc » dien cuc, dien luc, tien duc
duc hoc » duoc hoc, luc hoc, du hoc
tu sach » su sach, te sach, vu sach
tu cach » tu cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach kinh nghe duc hoc ) OR ( ((tu sach) OR (tu cach)) trinh dien duc hoc ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu sach kinh nghe duc hoc ) or ( ((tu sach) OR (tu cach)) trinh dien duc hoc ))~".
• Adding a wildcard symbol may retrieve word variants: (( thu sach kinh nghe duc hoc ) or ( ((tu sach) OR (tu cach)) trinh dien duc hoc ))*.