Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dung sai » dung tai, dung va, dung dat
sang tao » hang tai
hieu ve » hieu va, hieu van
sai cua » dai cua, hai cua, lai cua
thu xac » thau xay
tu sach » su sach, te sach, tu cach
tao hoi » tao khoi, tao boi, tay hoi
ky sang » ky nang, ky dang, ky tang
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 sang tao hoi. hieu ve nam ((thu xac) or (thu ha)) dung sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang tao hoi. hieu ve nam ((thu xac) OR (thu ha)) dung sai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky sang tao hoi. hieu ve nam ((thu xac) or (thu ha)) dung sai cua tre*.