Perhaps you should try some spelling variations:
dat thanh » dao thanh, dat khanh, dang thanh
day nhanh » day thanh, duy nhanh, dac nhan
cham thuc » nham thuc, pham thuc, tham thuc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tu » cua tuc, cua su, cua cu
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 cham thuc ((dat thanh) or (day nhanh)) di ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve cham thuc ((dat thanh) OR (day nhanh)) di ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu ve cham thuc ((dat thanh) or (day nhanh)) di ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve cham thuc ((dat thanh) or (day nhanh)) di ((cua te) OR (cua tu))*.