Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh tai » thanh hai, thanh toan, doanh tai
su triet » su viet, su tien, ve triet
thu van » thuc van, thuy van, tu van
te sach » toc sach
hieu le » hieu ve, hieu he, hieu ly
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
le nam » ly nam, he nam, le na

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 tang)) hoa hoc. hieu le nam thu van ((thanh tai) or (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky tang)) hoa hoc. hieu le nam thu van ((thanh tai) OR (thanh van)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky tang)) hoa hoc. hieu le nam thu van ((thanh tai) or (thanh van)) su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky tang)) hoa hoc. hieu le nam thu van ((thanh tai) or (thanh van)) su triet*.