Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
cam thuc » am thuc, nam thuc, cam thu
vu khach » vu khanh, vu khac, vay khach
hieu van » hieu va, thien van, lieu va
day hanh » day thanh, dao hanh, day manh
vu sach » vu bach, su sach
van cam » van nam, van lam, van cau
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 (vu khach)) ky nang x hoi. hieu van cam 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 (vu khach)) ky nang x hoi. hieu van cam 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 (vu khach)) ky nang x hoi. hieu van cam thuc ((day hanh) or (day nhanh)) de cua tre*".