Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
hai cua » dai cua, hoi cua, lai cua
va dau » va dao
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: thu sach ky nang x hoi. hieu qua cac duc va dau ((hai cua) OR (thai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu qua cac duc va dau ((hai cua) OR (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu qua cac duc va dau ((hai cua) OR (thai cua)) tre*.