Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham thuc » nham thuc, pham thuc, tham thuc
day nhanh » day thanh, duy nhanh, dac nhan
khach ky » hanh ky, thanh ky
vu khach » vu khanh, vu khac, vay khach
day hanh » day thanh, dao hanh, day manh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
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 khach ky nang x hoi. hieu ve cham thuc ((day hanh) or (day nhanh)) di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang x hoi. hieu ve cham thuc ((day hanh) OR (day nhanh)) di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang x hoi. hieu ve cham thuc ((day hanh) or (day nhanh)) di ((cua tre) or (cua triet))*.