Perhaps you should try some spelling variations:
van quang » van quan, tran quang, van tuan
cua triet » cua viet, su triet, va triet
van nang » van ban, van dong, van dung
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
so sach » so sanh, bo sach, co sach
va nam » van nam, ha nam
va nay » va ngay, va cay
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: so sach ((van nang) or (van quang)) xa hoi. hieu ((va nam) OR (va nay)) thuc dan hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((van nang) OR (van quang)) xa hoi. hieu ((va nam) OR (va nay)) thuc dan hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((van nang) or (van quang)) xa hoi. hieu ((va nam) OR (va nay)) thuc dan hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((van nang) or (van quang)) xa hoi. hieu ((va nam) OR (va nay)) thuc dan hanh vi cua triet*.