Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
dao hanh » dao thanh, dang hanh, ban hanh
cua tre » cuu tre, cua triet, dua tren
vu sach » vu bach, su sach, vu khach
cam thu » nam thu, cac thu, ca thu
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
cua te » cua tu
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 y nang x hoi. hieu va cam thu ((dao hanh) or (day thanh)) di ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x hoi. hieu va cam thu ((dao hanh) OR (day thanh)) di ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang x hoi. hieu va cam thu ((dao hanh) or (day thanh)) di ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x hoi. hieu va cam thu ((dao hanh) or (day thanh)) di ((cua tre) OR (cua te))*.