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
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
va cham » va chat, va tham
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 va cham thuc ((va sinh) or (vi sinh)) thai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tham nang ma hoi. hieu va 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 va cham thuc ((va sinh) or (vi sinh)) thai cua triet*.