Perhaps you should try some spelling variations:
dang xay » dang van, van xay
qua cham » qua hai, qua cac, va cham
cham cuu » cap cuu, chat cua
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach va » sach xa, sach ha, sach dao
va dang » van dang, va nang, va lang
xay hoi » xa hoi, tay hoi, cay phoi
va hanh » va thanh, va danh, ban hanh
cua tu » cua tuc, cua su, cua cu

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 va dang xay hoi. hieu qua cham cuu ((va hanh) OR (van hanh)) dai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach va dang xay hoi. hieu qua cham cuu ((va hanh) OR (van hanh)) dai ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach va dang xay hoi. hieu qua cham cuu ((va hanh) OR (van hanh)) dai ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: te sach va dang xay hoi. hieu qua cham cuu ((va hanh) OR (van hanh)) dai ((cua te) or (cua tu))*.