Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
vi cuu » vinh cuu
vi luu » vi lua
va cam » va cham, va cac, va cao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach y)) xang xa hoi. hieu va cam thuc van hanh ((vi cuu) OR (vi luu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (sach y)) xang xa hoi. hieu va cam thuc van hanh ((vi cuu) OR (vi luu)) tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach y)) xang xa hoi. hieu va cam thuc van hanh ((vi cuu) OR (vi luu)) tre*.