Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
ve triet » va trien, su triet
te sach » toc sach
sach lo » sach dao, sach doi, sach hoi
lo lang » o lang, so lang, le lang
van hoi » van hoc, van hoe, van loi
hieu vu » hieu va, hieu ve, hieu su
vu tham » va tham, vu kham, vu cham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh ke » hanh kem, thanh ke, hanh ky
ke ve » ke va, ke he, de ve

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 lo lang ((van hoi) OR (van hoa)). hieu vu tham thuc va hanh ke ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach lo lang ((van hoi) OR (van hoa)). hieu vu tham thuc va hanh ke ve triet".
• Adding a wildcard symbol may retrieve word variants: te sach lo lang ((van hoi) OR (van hoa)). hieu vu tham thuc va hanh ke ve triet*.