Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cap nuoc » dat nuoc
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
lang van » dang van, tang van, hoang van
nang xa » nang x, lang xa, nang ma
cac hoc » cach hoc, cac hop, bac hoc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di 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 y ((nang xa) or (lang van)) hoi. hieu van ((cap nuoc) or (cac hoc)) va danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (lang van)) hoi. hieu van ((cap nuoc) OR (cac hoc)) va danh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang xa) or (lang van)) hoi. hieu van ((cap nuoc) or (cac hoc)) va danh vi cua triet*.