Perhaps you should try some spelling variations:
sach van » sach han, bach van, cach van
vat hanh » vat thanh, van hanh, va hanh
sach va » sach xa, sach ha, sach dao
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
cua te » cua tu
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: tu ((sach van) or (sach va)) nang x hoi. hieu ((ve cai) or (va cam)) thuc vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach van) OR (sach va)) nang x hoi. hieu ((ve cai) OR (va cam)) thuc vat hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach van) or (sach va)) nang x hoi. hieu ((ve cai) or (va cam)) thuc vat hanh vi cua te*.