Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
tham thuc » nham thuc, pham thuc, tam thuc
day hanh » day thanh, dao hanh, day manh
ha manh » ho manh, ha anh, ha thanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
nang xa » nang x, lang xa, nang ma
san ky » sang ky, van ky, dan ky
vu san » va san, vu ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang xa hoi. hieu ve tham thuc ((((day hanh) or (ha manh))) or (day nhanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang xa hoi. hieu ve tham thuc ((((day hanh) OR (ha manh))) OR (day nhanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu san ky nang xa hoi. hieu ve tham thuc ((((day hanh) or (ha manh))) or (day nhanh)) dai cua tre*.