Perhaps you should try some spelling variations:
dang khoi » dung khoa, hang khoa
va triet » va trien, ve triet, cua triet
dan khai » dang khai, van khai, doan khac
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hac tuc » thac toc, thai tuc
sach ty » sach y, sach tu, sach thu
tuc va » thuc va, truc va, tuc xa
va hac » van hac, va khac, va cac
thiet » thieu

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