Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nha thuoc, cay thuoc
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
thanh di » thanh doi, thanh de, thanh do
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang x hoi. hieu van ((nam thuoc) or (nam thu)) vat thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang x hoi. hieu van ((nam thuoc) OR (nam thu)) vat thanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang x hoi. hieu van ((nam thuoc) or (nam thu)) vat thanh di cua triet*.