Perhaps you should try some spelling variations:
sach tham » sach nha
tham nang » nham nang, tham lang, tham nhung
cham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
va sinh » va kinh, va tinh, hoa 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 tham nang ma hoi. hieu van cham thuc ((va sinh) OR (vi sinh)) thai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tham nang ma hoi. hieu van cham thuc ((va sinh) OR (vi sinh)) thai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach tham nang ma hoi. hieu van cham thuc ((va sinh) OR (vi sinh)) thai cua triet*.