Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
san thanh » ban thanh, van thanh, son thanh
sach ly » sach y, sach ty, sach hay
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
dac san » dac sac, cac san, dac nhan
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
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 ly) OR (sach lo)) nang x hoi. hieu va cac dac san thanh dai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach lo)) nang x hoi. hieu va cac dac san thanh dai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ly) OR (sach lo)) nang x hoi. hieu va cac dac san thanh dai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) OR (sach lo)) nang x hoi. hieu va cac dac san thanh dai ((cua tre) or (cua te))*.