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