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