Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh hai » dang hai, lanh hai, manh hai
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
cua tu » cua tuc, cua su, cua cu
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y nang) OR (v nang)) cau hoi. ((hieu ve) OR (hieu van)) cam duc va danh hai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((y nang) or (v nang)) cau hoi. ((hieu ve) OR (hieu van)) cam duc va danh hai cua tu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((y nang) or (v nang)) cau hoi. ((hieu ve) OR (hieu van)) cam duc va danh hai cua tu*.