Perhaps you should try some spelling variations:
te sach » toc sach
dau cua » dai cua, day cua, cau cua
va danh » va dinh, va hanh, dia danh
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
va dan » ca dan, va dao, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((y nang) OR (ly nang)) cao hoi. hieu vu cham soc ((va danh) or (va dan)) dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ly nang)) cao hoi. hieu vu cham soc ((va danh) OR (va dan)) dau cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) cao hoi. hieu vu cham soc ((va danh) or (va dan)) dau cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) cao hoi. hieu vu cham soc ((va danh) or (va dan)) dau cua tre*.