Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
danh sai » dung sai, danh bat, danh dau
hang tai » hang va, dung tai
thau xay » thuat xay, tu xay, phan xay
tu sach » su sach, te sach, tu cach
sai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
tai hoi » tai khoi, dai hoi, tai hai
ky hang » ky nang, ly hang, ky dang
cua tre » cua te, cuu tre, cua triet
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky hang tai hoi. hieu ve nam ((thau xay) or (thu ha)) danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky hang tai hoi. hieu ve nam ((thau xay) OR (thu ha)) danh sai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky hang tai hoi. hieu ve nam ((thau xay) or (thu ha)) danh sai cua tre*.