Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tan hanh » tan thanh, tang hanh, toan hanh
ly nang » ky nang, ly hang, ly quang
ly vang » ly hang, ly van, ly quang
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
hai cua » thai cua, hoi cua, lai cua
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 ((ly nang) OR (ly vang)) x hoi. hieu va giao duc tan hanh ((dai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly nang) OR (ly vang)) x hoi. hieu va giao duc tan hanh ((dai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly nang) OR (ly vang)) x hoi. hieu va giao duc tan hanh ((dai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly nang) OR (ly vang)) x hoi. hieu va giao duc tan hanh ((dai cua) or (hai cua)) tre*.