Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va danh » va dinh, va hanh, dia danh
co tuc » co thuc, co tu, co toc
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, 5 hoi
va co » vo co

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

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