Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa

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) or (toc sach)) ly ((nang xa) or (nang x)) hoi. hieu ve tham thuc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly ((nang xa) OR (nang x)) hoi. hieu ve tham thuc va hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ly ((nang xa) or (nang x)) hoi. hieu ve tham thuc va hanh doi cua tre*.