Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
cau tren » cu tren, ca tren, cau treo
cau theo » cau thi, cau tao
dau tren » dau tien, dat tren, dau tieng
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach tu » sach thu, cach tu, sach ty
hanh ve » hanh vi, hanh va, hanh kem
tu nang » tru nang, tu nong, tu nano
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
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: toc sach tu nang x hoi. hieu va cham tuc va hanh ve ((cau theo) or (((cau tren) or (dau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang x hoi. hieu va cham tuc va hanh ve ((cau theo) OR (((cau tren) OR (dau tren)))).
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang x hoi. hieu va cham tuc va hanh ve ((cau theo) or (((cau tren) or (dau tren))))*.