Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
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 v » sach va, sach y, sach vay
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 v) OR (sach 2)) nang x hoi. hieu van nham thuc vat hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) 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 v) OR (sach 2)) nang x hoi. hieu van nham thuc vat hanh vi cua te*.