Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
cam thuc » am thuc, nam thuc, cam thu
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
tu cam » tu cham, tu cac, tu nam
cam ky » cao ky, cac ky
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cam ky nang ((ma hoi) or (mai hoi)). hieu ve cam thuc va danh vi dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cam ky nang ((ma hoi) OR (mai hoi)). hieu ve cam thuc va danh vi dau tieng*.