Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang lai » nang tai, mang lai, nang cai
sach thu » sach thue, sach tham, cach thuc
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
hieu va » hieu qua
lai roi » lai hoi, loi roi
co duc » co duoc, cao duc, do duc
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach thieu)) nang lai roi. ((hieu va) or (lieu va)) co duc va dan vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thieu)) nang lai roi. ((hieu va) OR (lieu va)) co duc va dan vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thieu)) nang lai roi. ((hieu va) or (lieu va)) co duc va dan vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach thieu)) nang lai roi. ((hieu va) or (lieu va)) co duc va dan vai cua triet*.