Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
va cham » va chat, va tham
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
ve chat » va chat, van chat
cao hoc » co hoc, cho hoc, chat hoc
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua
cua te » cua tu

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: ((toc sach) OR (thuoc sach)) y nang cao hoc. hieu ((ve chat) OR (va cham)) duc va danh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) y nang cao hoc. hieu ((ve chat) or (va cham)) duc va danh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) y nang cao hoc. hieu ((ve chat) or (va cham)) duc va danh vi cua te*.