Perhaps you should try some spelling variations:
toc sac » toc sach, toc san, hoc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
tai cua » thai cua, tri cua, dai cua
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc 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: toc sac ky tang ma hoi. hieu va cam ((xuc va) OR (truc va)) thanh ((tai cua) OR (tai cuc)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky tang ma hoi. hieu va cam ((xuc va) or (truc va)) thanh ((tai cua) OR (tai cuc)) te~".
• Adding a wildcard symbol may retrieve word variants: toc sac ky tang ma hoi. hieu va cam ((xuc va) or (truc va)) thanh ((tai cua) OR (tai cuc)) te*.