Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dang xay » dang van, van xay
te sach » toc sach
cam tuc » cam xuc, cam tu, nam thuc
vai cua » hai cua, lai cua, bai cua
tuc van » thuc van, truc van, tuc va
hieu va » lieu va, hieu qua
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach o dang xay hoi. ((hieu ve) OR (hieu va)) cam tuc van thanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o dang xay hoi. ((hieu ve) OR (hieu va)) cam tuc van thanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o dang xay hoi. ((hieu ve) OR (hieu va)) cam tuc van thanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach o dang xay hoi. ((hieu ve) OR (hieu va)) cam tuc van thanh ((vai cua) or (dai cua)) tre*.