Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
sach ly » sach y, sach lo, sach ty
doi cua » dai cua, hoi cua
va hanh » van hanh, va danh, ban hanh
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
lang ha » long ha
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly ((nang xa) or (lang ha)) hoi. hieu ve tham thuc ((va hanh) or (va thanh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly ((nang xa) OR (lang ha)) hoi. hieu ve tham thuc ((va hanh) OR (va thanh)) doi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly ((nang xa) or (lang ha)) hoi. hieu ve tham thuc ((va hanh) or (va thanh)) doi cua tre*.