Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, tu cach
te sach » toc sach
ve phan » ke phan, ve phat, vi phan
va phan » van phan, va phat, va phap
duc van » duc va, duc tan, duc manh
minh su » hinh su, dinh su, tinh su
y nang » ky nang, ly nang, v nang
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang x ho. hieu ((ve phan) OR (va phan)) duc van minh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang x ho. hieu ((ve phan) OR (va phan)) duc van minh su va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang x ho. hieu ((ve phan) OR (va phan)) duc van minh su va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang x ho. hieu ((ve phan) OR (va phan)) duc van minh su va triet*.