Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sinh thai » dinh thi
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
va triet » va thiet, va trien, ve triet
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
va sinh » va kinh, va tinh, vi sinh
thai va » thai van
ma hoi » mai hoi, ma hoa, me hoi

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 han nang ((ma hoi) OR (xa hoi)). hieu van cham thuc va sinh thai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach han nang ((ma hoi) OR (xa hoi)). hieu van cham thuc va sinh thai va triet".
• Adding a wildcard symbol may retrieve word variants: te sach han nang ((ma hoi) OR (xa hoi)). hieu van cham thuc va sinh thai va triet*.