Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang tai » hang tai, tang tai, sang tai
hang hai » hoang hai, hang tai, thanh hai
pham day » phap day, pham duy, pham xay
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
tai hoi » tai khoi, dai hoi, tai hai
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang tai hoi. ((hieu ve) OR (hieu va)) pham day va ((hang hai) or (hang va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang tai hoi. ((hieu ve) OR (hieu va)) pham day va ((hang hai) OR (hang va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang tai hoi. ((hieu ve) OR (hieu va)) pham day va ((hang hai) or (hang va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang tai hoi. ((hieu ve) OR (hieu va)) pham day va ((hang hai) or (hang va)) cua triet*.