Perhaps you should try some spelling variations:
sach truc » cach thuc, sach tren, sach thu
truc nang » truc nano, tru nang, truc trang
nham thuc » nhan thuc, nam thuc, nham thu
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach truc nang x hoi. hieu ve nham thuc va hanh vi ((dua tren) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: thu sach truc nang x hoi. hieu ve nham thuc va hanh vi ((dua tren) or (cuu tre))*.