Perhaps you should try some spelling variations:
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
dau cua » day cua, cau cua, dan cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 cao hoi. hieu va kham ((xuc va) or (luc va)) dan ((dau cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang cao hoi. hieu va kham ((xuc va) OR (luc va)) dan ((dau cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach y nang cao hoi. hieu va kham ((xuc va) or (luc va)) dan ((dau cua) or (dai cua)) te*.