Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
nang ma » tang ma, sang ma, nang cao
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (sac ky)) nang ma hoa. hieu van tham thuc van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) nang ma hoa. hieu van tham thuc van hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sac ky)) nang ma hoa. hieu van tham thuc van hanh vai cua triet*.