Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
te sach » toc sach
cam tuc » cam xuc, cam tu, dam thuc
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
sach o » sach lo, sac o, sach y
o dang » xo dang, do dang, so dang
vi cua » vai cua, di cua

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 va ((cam tuc) OR (nam thuc)) van thanh ((vi 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 va ((cam tuc) OR (nam thuc)) van thanh ((vi 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 va ((cam tuc) OR (nam thuc)) van thanh ((vi cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach o dang xay hoi. hieu va ((cam tuc) OR (nam thuc)) van thanh ((vi cua) or (dai cua)) tre*.