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