Perhaps you should try some spelling variations:
dao thanh » ban thanh, tro thanh, de thanh
day thanh » dat thanh, da thanh, dam thanh
cam thuc » am thuc, nam thuc, cam thu
tu cham » toc cham, thi cham
cuu tre » cua tre, cau tren, cau treo
cham ky » pham ky, cam ky
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
va cuu » va cau, va chu, va huu
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: tu cham ky nang ((ma hoi) OR (mai hoi)). hieu va cam thuc ((day thanh) OR (dao thanh)) va cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cham ky nang ((ma hoi) or (mai hoi)). hieu va cam thuc ((day thanh) OR (dao thanh)) va cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu cham ky nang ((ma hoi) or (mai hoi)). hieu va cam thuc ((day thanh) OR (dao thanh)) va cuu tre*.