Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
viet cua » viec cua, viet ca, viet qua
te sach » toc sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh

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 ((qua cac) or (cua cac)) duc van anh viet 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 ((qua cac) OR (cua cac)) duc van anh viet 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 ((qua cac) or (cua cac)) duc van anh viet cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky dang)) xa hoi. hieu ((qua cac) or (cua cac)) duc van anh viet cua triet*.