Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
dau cua » dai cua, day cua, cau cua
dan dau » danh dau, doan dau, van dau
hieu ve » hieu van
may hoi » may thoi, tay hoi, mai hoi
va dan » ca dan, va dao, va dau
y mang » cay mang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) y mang may hoi. ((hieu ve) OR (hieu va)) cham duc va dan dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y mang may hoi. ((hieu ve) OR (hieu va)) cham duc va dan dau cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y mang may hoi. ((hieu ve) OR (hieu va)) cham duc va dan dau cua triet*".