Perhaps you should try some spelling variations:
sang tao » hang tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
so cham » so kham, co cham, so chat
sach ky » sac ky, sach y, sach ty
hieu so » thieu so
sang ma » tang ma, nang ma, mang may
cua tre » cua te, cuu tre, cua triet
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((sang ma) OR (sang tao)) hoa. hieu so cham ((thuc va) or (tuc xa)) dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang ma) OR (sang tao)) hoa. hieu so cham ((thuc va) OR (tuc xa)) dan vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((sang ma) OR (sang tao)) hoa. hieu so cham ((thuc va) or (tuc xa)) dan vi cua tre*".