Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua tre » cua te, cuu tre, cua triet
ve nham » ve nha, ve cham
sang ma » tang ma, sang tao, sang tai
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, nang cao
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua
dan vi » doan vi, don vi, dan va
va dan » ca dan, va dao, va dau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((((sang ma) or (mang may))) or (nang ma)) hoi. hieu ve nham thuc va dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((((sang ma) OR (mang may))) OR (nang ma)) hoi. hieu ve nham thuc va dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((((sang ma) or (mang may))) or (nang ma)) hoi. hieu ve nham thuc va dan vi cua tre*.