Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cham thuc » nham thuc, tham thuc, pham thuoc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
sai cua » hai cua, lai cua, bai cua
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky lang xa hoi. hieu qua ((cham thuc) or (pham thuc)) va danh ((sai cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky lang xa hoi. hieu qua ((cham thuc) OR (pham thuc)) va danh ((sai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky lang xa hoi. hieu qua ((cham thuc) or (pham thuc)) va danh ((sai cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sac ky lang xa hoi. hieu qua ((cham thuc) or (pham thuc)) va danh ((sai cua) OR (dai cua)) te*.