Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
toc sac » toc sach, toc san, doc sach
tai cua » thai cua, tai cuc, tri cua
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 sac) OR (hoc sach)) ky tang ma hoi. hieu va cam ((xuc va) OR (truc va)) thanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (hoc sach)) ky tang ma hoi. hieu va cam ((xuc va) or (truc va)) thanh tai cua te~".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (hoc sach)) ky tang ma hoi. hieu va cam ((xuc va) or (truc va)) thanh tai cua te*.