Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
cua triet » cua viet, su triet, va triet
may khoa » da khoa, ly khoa, y khoa
hieu van » hieu va, thien van, lieu va
van chay » van chat, san chay, toan chay
tu sach » thu sach, su sach, te sach
ky mang » ky nang, ke mang, ky tang
ky dang » ky nang, ky danh
dua ban » dia ban, cua ban, qua ban
van cua » vang cua, ban cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky mang) or (ky dang)) may khoa. hieu van chay dua ban thanh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky mang) OR (ky dang)) may khoa. hieu van chay dua ban thanh van cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky mang) or (ky dang)) may khoa. hieu van chay dua ban thanh van cua triet*.