Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau theo » cau thi, cau tao
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, lang van
te sach » toc sach
vi cau » va cau, ve cau, di cau

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 ky ((lang xa) OR (dang xay)) hoi. hieu van cam luc ((va hanh) or (ban thanh)) vi cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (dang xay)) hoi. hieu van cam luc ((va hanh) OR (ban thanh)) vi cau theo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) OR (dang xay)) hoi. hieu van cam luc ((va hanh) or (ban thanh)) vi cau theo*".