Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
dieu cua » dieu tra
day hanh » day thanh, dao hanh, day manh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ve pham » vi pham, ve phan, ve phat
cua tre » cua te, cuu tre, cua triet
v pham » vi pham, d pham
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: vu sach ky nang x hoi. hieu ((ve pham) or (v pham)) thuc ((day hanh) or (day nhanh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ((ve pham) OR (v pham)) thuc ((day hanh) OR (day nhanh)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ((ve pham) or (v pham)) thuc ((day hanh) or (day nhanh)) dieu cua tre*.