Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
ve nham » ve nha, ve cham
hieu ve » hieu va, hieu van
tai hai » thi hai, dai hai, tai ha
sach ky » sach y, sach ty, sach kem
tao hai » tao dai, tao tai, tao hoi
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
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: su ((sach ky) or (sac ky)) sang ((tao hai) OR (tai hai)). hieu ve nham thuc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) sang ((tao hai) OR (tai hai)). hieu ve nham thuc va danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) sang ((tao hai) OR (tai hai)). hieu ve nham thuc va danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) sang ((tao hai) OR (tai hai)). hieu ve nham thuc va danh vi cua te*.