Perhaps you should try some spelling variations:
te sach » toc sach
dau cua » day cua, cau cua, dan cua
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va kham » va cham, va khao, va tham
tuc va » thuc va, truc va, tuc xa
xuc va » duc va, luc va, xac va
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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