Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh lai » tinh lao, tinh hai, minh lai
pham duy » pham duc
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
va tinh » may tinh
vu pham » su pham, vi pham, vu kham
hieu vu » hieu va, hieu ve, hieu su
dai hoi » dai hoc, dai hai, dai moi
tai hoi » tai khoi, tai hai, tai hoe
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
duy va » duy vat, duy van, day va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ty hang ((tai hoi) or (dai hoi)). hieu vu pham duy va tinh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ty hang ((tai hoi) OR (dai hoi)). hieu vu pham duy va tinh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thuoc sach)) ty hang ((tai hoi) or (dai hoi)). hieu vu pham duy va tinh lai cua tre*.