Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
x quang » xa quang, vu quang, le quang
_ quang » vu quang, le quang, ly quang
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
luc va » duc va, tuc va, loc 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: toc sach ((x quang) OR (_ quang)) xa hoi. hieu va cac ((luc va) or (tuc xa)) danh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((x quang) OR (_ quang)) xa hoi. hieu va cac ((luc va) OR (tuc xa)) danh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((x quang) OR (_ quang)) xa hoi. hieu va cac ((luc va) or (tuc xa)) danh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((x quang) OR (_ quang)) xa hoi. hieu va cac ((luc va) or (tuc xa)) danh vi cua triet*.