Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((cach tu) or (cach thuc)) dang xay hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((cach tu) OR (cach thuc)) dang xay hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((cach tu) or (cach thuc)) dang xay hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((cach tu) or (cach thuc)) dang xay hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre*.