Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang vi » hang va, hanh vi, hang di
tuc ban » thuc ban, truc ban, tuc dan
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
va cam » va cham, va cac, va cao
y lang » _ lang, tay lang, yen lang
o lang » hoa lang, hoi lang
tu ban » thu ban, te ban
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: su sach ((y lang) or (o lang)) xa hoi. hieu va cam ((tuc ban) OR (tu ban)) hang vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y lang) OR (o lang)) xa hoi. hieu va cam ((tuc ban) OR (tu ban)) hang vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y lang) or (o lang)) xa hoi. hieu va cam ((tuc ban) OR (tu ban)) hang vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y lang) or (o lang)) xa hoi. hieu va cam ((tuc ban) OR (tu ban)) hang vi cua triet*.