Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
nham nang » phap nang, cam nang, kha nang
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 nham nang ma hoi. hieu van 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 nham 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 nham nang ma hoi. hieu van cham thuc ((va sinh) or (vi sinh)) thai cua triet*.