Perhaps you should try some spelling variations:
dung khoa » dung cho
va triet » va thiet, va trien, ve triet
dan khai » dang khai, van khai, dang khoi
hieu van » hieu va, thien van, lieu va
te sach » toc sach
van hac » van hoc, van ha, van hai
ty nang » ty xang, ty hang, ly nang
hac tuc » thac toc, thai tuc
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 ((ty nang) OR (ky nang)) xa hoi. hieu van hac tuc va ((dan khai) or (dung khoa)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) xa hoi. hieu van hac tuc va ((dan khai) OR (dung khoa)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) xa hoi. hieu van hac tuc va ((dan khai) or (dung khoa)) va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ky nang)) xa hoi. hieu van hac tuc va ((dan khai) or (dung khoa)) va triet*.