Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hang hai » hoang hai, hang tai, thanh hai
cao hoi » cau hoi, co hoi, cao hoc
va hang » van hang, va nang, va lang
hai cua » thai cua, dai cua, hoi cua
y nang » ky nang, ly nang, v nang

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) OR (hoc sach)) y nang cao hoi. lieu va ((cam xuc) or (pham duc)) va hang hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang cao hoi. lieu va ((cam xuc) OR (pham duc)) va hang hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang cao hoi. lieu va ((cam xuc) or (pham duc)) va hang hai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) y nang cao hoi. lieu va ((cam xuc) or (pham duc)) va hang hai cua triet*.