Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
va hanh » van hanh, va thanh, va danh
hoi cua » hoi chuc
doi cua » dai cua, dong cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
ve cam » ve cham, ve cac, va cam
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sai ky)) nang xa hoi. hieu ve cam thuc va hanh ((doi cua) OR (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sai ky)) nang xa hoi. hieu ve cam thuc va hanh ((doi cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sai ky)) nang xa hoi. hieu ve cam thuc va hanh ((doi cua) OR (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sai ky)) nang xa hoi. hieu ve cam thuc va hanh ((doi cua) OR (hoi cua)) te*.