Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hai tuc » thai tuc, hai cuc, thai thuc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
va hai » van hai, va chai, va khai

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 y ((nang xa) or (van xay)) hoi. hieu va hai tuc ((va hanh) or (va danh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (van xay)) hoi. hieu va hai tuc ((va hanh) OR (va danh)) va su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (van xay)) hoi. hieu va hai tuc ((va hanh) or (va danh)) va su triet*.