Perhaps you should try some spelling variations:
sach doi » sach hoi, sach moi, sach dao
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach lo » sach dao, sach hoi, sach moi
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach lo) or (sach doi)) nang x hoi. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach lo) OR (sach doi)) nang x hoi. hieu ve cam ((duc va) OR (thuc vat)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu ((sach lo) or (sach doi)) nang x hoi. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre*.