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

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 ho. 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 ho. 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 ho. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre*.