Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach ty
cam tuc » cam tu, nam thuc, dam thuc
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
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 tu ((nang xa) or (nang cao)) hoi. hieu van ((cam tuc) or (cam xuc)) va dan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((nang xa) OR (nang cao)) hoi. hieu van ((cam tuc) OR (cam xuc)) va dan vi cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach tu ((nang xa) or (nang cao)) hoi. hieu van ((cam tuc) or (cam xuc)) va dan vi cua triet*.