Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh vai » thanh hai, thanh tai, thanh oai
su triet » su viet, su tien, ve triet
thu van » thuc van, thuy van, tu van
te sach » toc sach
hieu he » hieu ve, hiem he, hieu le
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
he nam » ha nam, nghe nam

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)) hoa hoc. hieu he nam thu van ((thanh vai) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky dang)) hoa hoc. hieu he nam thu van ((thanh vai) OR (thanh van)) su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky dang)) hoa hoc. hieu he nam thu van ((thanh vai) or (thanh van)) su triet*.