Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
day nhanh » day thanh, duy nhanh, dac nhan
day hanh » day thanh, day manh, da hanh
dao hanh » dao thanh, dang hanh, ban hanh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu 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 pham thuc ((((day hanh) or (dao hanh))) or (day nhanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu ve pham thuc ((((day hanh) OR (dao hanh))) OR (day nhanh)) de cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu ve pham thuc ((((day hanh) or (dao hanh))) or (day nhanh)) de cua tre*.