Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
da thanh » dao thanh, dat thanh, dam thanh
cam thuc » am thuc, nam thuc, cam thu
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
thuc da » thuc dan, thuc day, thuc dia
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam
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 ty ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc da thanh va ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc da thanh va ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cam thuc da thanh va ((cua tre) or (cua te))*".