Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cam thuc » am thuc, nam thuc, cam thu
dang xay » dang van, van xay
te sach » toc sach
va hanh » va thanh, va danh, ban hanh
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
cua tuc » cua duc, cua tu, cua thuoc
sach o » sach lo, sac o, sach y
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua

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 o ((lang xa) OR (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) vi cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o ((lang xa) or (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) vi cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach o ((lang xa) or (dang xay)) hoi. hieu ve cam thuc ((va hanh) OR (van hanh)) vi cua tuc*.