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
dau cua » day cua, cau cua, dan cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van 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 v nang cao hoi. hieu va khao ((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 v nang cao hoi. hieu va khao ((xuc va) OR (luc va)) dan ((dau cua) OR (dai cua)) te.
• Adding a wildcard symbol may retrieve word variants: te sach v nang cao hoi. hieu va khao ((xuc va) or (luc va)) dan ((dau cua) or (dai cua)) te*.