Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang hai » dang khai, hang hai, dung hai
dan hai » doan hai, dan khai, van hai
te sach » toc sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa

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 ((ky lang) OR (ky dang)) xa hoi. hieu va cac tuc va ((dan hai) or (dang hai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) xa hoi. hieu va cac tuc va ((dan hai) OR (dang hai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky dang)) xa hoi. hieu va cac tuc va ((dan hai) or (dang hai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky dang)) xa hoi. hieu va cac tuc va ((dan hai) or (dang hai)) cua triet*.