Perhaps you should try some spelling variations:
te sach » toc sach
hanh ly » khanh ly, hanh ky, hang ly
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
dai hoi » dai hoc, dai hai, dai moi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cuu va » cuu van
ma hoi » mai hoi, xa hoi, ma hoa
ly cua » le cua

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: te sach y nang ((ma hoi) OR (dai hoi)). hieu su cham ((cuu va) OR (cuu ve)) hanh ly cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (dai hoi)). hieu su cham ((cuu va) OR (cuu ve)) hanh ly cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (dai hoi)). hieu su cham ((cuu va) OR (cuu ve)) hanh ly cua tre*.