Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thai cua » than cua, tri cua, dai cua
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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 ky dang xa hoi. lieu va cam ((tuc va) or (hoc va)) hang ((thai cua) OR (tai cuc)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xa hoi. lieu va cam ((tuc va) OR (hoc va)) hang ((thai cua) OR (tai cuc)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xa hoi. lieu va cam ((tuc va) or (hoc va)) hang ((thai cua) OR (tai cuc)) te".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xa hoi. lieu va cam ((tuc va) or (hoc va)) hang ((thai cua) OR (tai cuc)) te*.