Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh lai » thanh hai, thanh lap, thanh loi
doc sach » toc sach, nuoc sach, dac sac
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
lai cua » dai cua, hai cua, lai chau
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (hoc sach)) ky nang x hoi. hieu va cam ((xuc va) OR (duc va)) thanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) ky nang x hoi. hieu va cam ((xuc va) OR (duc va)) thanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (hoc sach)) ky nang x hoi. hieu va cam ((xuc va) OR (duc va)) thanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (hoc sach)) ky nang x hoi. hieu va cam ((xuc va) OR (duc va)) thanh lai cua triet*.