Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
sinh thai » dinh thi
cua triet » cua viet, su triet, va triet
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
hieu van » thien van, lieu va, hieu ve
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va sinh » va kinh, va tinh, vi sinh
ma hoi » mai hoi, xa hoi, ma hoa

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