Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lap » thanh san, phan lap, thanh hai
hanh lai » hanh lam, hanh tai, thanh loi
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
_ lang » o lang, _ land
2 lang » 22 lang, o lang

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 ((2 lang) or (_ lang)) xa hoi. hieu va cac luc van ((hanh lai) OR (thanh lap)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((2 lang) OR (_ lang)) xa hoi. hieu va cac luc van ((hanh lai) OR (thanh lap)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((2 lang) or (_ lang)) xa hoi. hieu va cac luc van ((hanh lai) OR (thanh lap)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((2 lang) or (_ lang)) xa hoi. hieu va cac luc van ((hanh lai) OR (thanh lap)) cua triet*.