Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
ve chat » va chat, van chat
tai cua » thai cua, tai cuc, tri cua
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu
ac va » tac va, bac va, mac va

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: ((te sach) OR (toc sach)) y nang ma hoa. hieu ve chat ((ac va) OR (luc va)) hanh tai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang ma hoa. hieu ve chat ((ac va) or (luc va)) hanh tai cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang ma hoa. hieu ve chat ((ac va) or (luc va)) hanh tai cua tu*.