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, dao hanh, day manh
ve pham » vi pham, v pham, ve phan
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
su sach » so sach
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) OR (su sach)) ky nang x hoi. hieu ve pham thuc ((day hanh) or (day nhanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky nang x hoi. hieu ve pham thuc ((day hanh) OR (day nhanh)) de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky nang x hoi. hieu ve pham thuc ((day hanh) or (day nhanh)) de cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky nang x hoi. hieu ve pham thuc ((day hanh) or (day nhanh)) de cua tre*.