Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc van » luoc can, luoc va, luot van
hanh dai » hanh tai, hanh dao, vanh dai
sach lo » sach dao, sach doi, sach hoi
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
luc van » luu van, duc van, luc va
sach o » sac o, sach y, mach o

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