Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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 ty dang xay hoi. hieu ((ve cam) or (va cam)) duc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang xay hoi. hieu ((ve cam) OR (va cam)) duc van hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang xay hoi. hieu ((ve cam) or (va cam)) duc van hanh lai cua tre*.