Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh doi » trinh doc, trinh do, tinh hoc
nam thuc » nam thuoc, am thuc, nam thu
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach lo » sach dao, sach doi, sach hoi
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
doi cua » dai cua, hoi cua
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: toc ((sach o) OR (sach lo)) lang xa hoi. ((hieu ve) or (hieu va)) nam thuc va tinh doi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach o) OR (sach lo)) lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc va tinh doi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach o) OR (sach lo)) lang xa hoi. ((hieu ve) or (hieu va)) nam thuc va tinh doi cua triet".
• Adding a wildcard symbol may retrieve word variants: toc ((sach o) OR (sach lo)) lang xa hoi. ((hieu ve) or (hieu va)) nam thuc va tinh doi cua triet*.