Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
ve nam » he nam, va nam, le nam
cua tu » cua tuc, cua su, cua cu

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 (thu sach)) ky dang xa hoi. hieu ve nam thuc day hanh vi ((cua tre) OR (cua tu))~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky dang xa hoi. hieu ve nam thuc day hanh vi ((cua tre) or (cua tu))*.