Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dai » thanh hai, thanh tai, thanh oai
toc sach » hoc sach, doc sach, thuoc sach
cam truc » cau truc, nam truc, lam truoc
mai khoi » mai khoa, tai khoa, cac khoi
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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 ((ma hoi) OR (mai khoi)). hieu va cam truc va ((thanh dai) OR (thanh dat)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((ma hoi) or (mai khoi)). hieu va cam truc va ((thanh dai) OR (thanh dat)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((ma hoi) or (mai khoi)). hieu va cam truc va ((thanh dai) OR (thanh dat)) cua tre*.