Perhaps you should try some spelling variations:
tat hanh » tat thanh, nhat hanh, dat khanh
thuc tat » thuc vat, thuc tap, thuc tai
cam thuc » am thuc, nam thuc, cam thu
sach ky » sac ky, sach ty, sach kem
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
ve cam » ve cham, ve cac, va cam
va cua » va chua, via cua, ca cua

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 (sach y)) ((nang ma) or (tang ma)) hoi. hieu ve cam thuc tat hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nang ma) OR (tang ma)) hoi. hieu ve cam thuc tat hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) ((nang ma) or (tang ma)) hoi. hieu ve cam thuc tat hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) ((nang ma) or (tang ma)) hoi. hieu ve cam thuc tat hanh va cua tre*.