Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
danh lai » danh sai, gianh lai, dinh lam
lai cua » dai cua, hai cua, lai chau
ty sang » ty xang, ty hang, duy sang
sang ma » tang ma, nang ma, sang tao
hieu v » hieu va, hieu ve, hieu 2
ma hoi » mai hoi, xa hoi, ma hoa
duy va » duy vat, duy van, duy v
v pham » vi pham, d pham

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu v pham ((duy va) OR (day va)) danh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) ty sang ma hoi. hieu v pham ((duy va) OR (day va)) danh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu v pham ((duy va) OR (day va)) danh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) ty sang ma hoi. hieu v pham ((duy va) OR (day va)) danh lai cua triet*.