Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
va nam » van nam, ha nam
va nay » va ngay, va cay
ki su » ky su

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: vu sach ky nang x ho. lieu ((va nam) OR (va nay)) tu ((va thanh) OR (va danh)) ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. lieu ((va nam) OR (va nay)) tu ((va thanh) or (va danh)) ki su triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. lieu ((va nam) OR (va nay)) tu ((va thanh) or (va danh)) ki su triet*.