Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh ve » thanh va, thanh vien, thanh van
cau tren » cu tren, dau tren, ca tren
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va
xuc gia » duc gia, luc gia, tuc gia
hanh ve » hanh vi, hanh va, hanh kem
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: toc sach v nang cao hoi. ((hieu va) or (hieu qua)) cam xuc gia ((thanh ve) or (hanh ve)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang cao hoi. ((hieu va) OR (hieu qua)) cam xuc gia ((thanh ve) OR (hanh ve)) cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang cao hoi. ((hieu va) or (hieu qua)) cam xuc gia ((thanh ve) or (hanh ve)) cau tren*.