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