Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
vanh tai » van tai, hanh tai, anh tai
vanh dai » van dai, lanh dao, van dao
nang noi » nang doc
thuc day » thuc dan, thuc vat
ve pham » vi pham, v pham, ve phan
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
noi hoi » noi doi, doi hoi, hoi hoi
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sac ky)) nang noi hoi. hieu ve pham thuc day ((vanh dai) OR (vanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang noi hoi. hieu ve pham thuc day ((vanh dai) OR (vanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang noi hoi. hieu ve pham thuc day ((vanh dai) OR (vanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang noi hoi. hieu ve pham thuc day ((vanh dai) OR (vanh tai)) cua te*.