Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
thu sach » tu sach, thuat sach, thuoc sach
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
dua tren » dung tren
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
truc va » thuc va, thuc vat, trung va
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 tru nang x hoi. hieu ve cham truc va hanh vi ((dua tren) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: thu sach tru nang x hoi. hieu ve cham truc va hanh vi ((dua tren) or (cuu tre))*.