Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
so sach » so sanh, bo sach, co sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hieu ve » hieu va, hieu van
tai cua » thai cua, tai cuc, tri cua
ve cau » ke cau, va cau, ve cac
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: so sach ly hang ((tao boi) or (y thai)). hieu ve cau thuc vat hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly hang ((tao boi) OR (y thai)). hieu ve cau thuc vat hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ly hang ((tao boi) or (y thai)). hieu ve cau thuc vat hanh tai cua te*.