Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
va hanh » van hanh, va thanh, va danh
cai hoi » cau hoi, dai hoi, lai hoi
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
cai hoa » cau hoa, cam hoa, dai hoa
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((cai hoi) or (cai hoa)). hieu ve cam thuc va hanh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((cai hoi) OR (cai hoa)). hieu ve cam thuc va hanh ((hai cua) OR (hoi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((cai hoi) or (cai hoa)). hieu ve cam thuc va hanh ((hai cua) or (hoi cua)) tre*.