Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
thai cua » than cua, tai cuc, tri cua
hoc sach » hoc sinh, hoc cac, hoc anh
han thai » han tai, ban thai, van thai
cam tuc » cam xuc, cam tu, nam thuc
ky sang » ky nang, ky dang, ky tang
va han » va phan, van han, va hanh
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu
va cam » va cham, va cac, va cao
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) ky sang ((ma hoi) OR (xa hoi)). lieu va cam tuc va han thai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky sang ((ma hoi) OR (xa hoi)). lieu va cam tuc va han thai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (hoc sach)) ky sang ((ma hoi) OR (xa hoi)). lieu va cam tuc va han thai cua tu*".