Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
tu sach » thu sach, su sach, tu cach
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
te sach » toc sach
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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: ((tu sach) OR (te sach)) thieu ((nang xa) OR (nang x)) hoi. hieu va cam truc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) thieu ((nang xa) or (nang x)) hoi. hieu va cam truc va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) thieu ((nang xa) or (nang x)) hoi. hieu va cam truc va hanh vi cua tre*.