Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
lai cua » dai cua, hai cua, thai cua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. lieu va cam ((tuc va) or (tuc xa)) hanh ((lai cua) OR (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x hoi. lieu va cam ((tuc va) OR (tuc xa)) hanh ((lai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x hoi. lieu va cam ((tuc va) or (tuc xa)) hanh ((lai cua) OR (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang x hoi. lieu va cam ((tuc va) or (tuc xa)) hanh ((lai cua) OR (lai chau)) tre*.