Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
bai cua » ban cua, dai cua, bai ca
hoi cua » hoi chuc
x hoi » xa hoi, o hoi, 5 hoi

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 ly nang ((x hoi) OR (x ho)). hieu va giao duc tan hanh ((bai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ((x hoi) OR (x ho)). hieu va giao duc tan hanh ((bai cua) OR (hoi cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ((x hoi) OR (x ho)). hieu va giao duc tan hanh ((bai cua) or (hoi cua)) tre*".