Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
sach vay » sach va, sach hay, sach nay
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
vat hanh » vat thanh, van hanh, va hanh
sach 2 » sach y
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: su ((sach vay) or (sach 2)) nang x hoi. hieu van nham thuc vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vay) OR (sach 2)) nang x hoi. hieu van nham thuc vat hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach vay) or (sach 2)) nang x hoi. hieu van nham thuc vat hanh vi cua te*.