Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, dao hanh, day manh
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
di cua » dai cua, doi cua, de cua
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) OR (day nhanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang ((x hoi) OR (xa hoi)). hieu ve nham thuc ((day hanh) or (day nhanh)) di cua te*.