Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
thanh di » thanh doi, thanh de, thanh do
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua

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 ky nang xa hoi. hieu van ((nam thuc) or (nam thu)) vat thanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van ((nam thuc) OR (nam thu)) vat thanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van ((nam thuc) or (nam thu)) vat thanh di cua triet*.