Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
bai cua » dai cua, bai ca, lai cua
ban cua » ban quan
hai cua » thai cua, dai cua, hoi 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: tu sach ky nang x hoi. hieu va giao duc tan hanh ((((bai cua) or (ban cua))) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu va giao duc tan hanh ((((bai cua) OR (ban cua))) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu va giao duc tan hanh ((((bai cua) or (ban cua))) or (hai cua)) tre*.