Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
cac tu » cac thu, cach tu, cac du
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x ho. hieu va cac tu ((va thanh) or (((va danh) OR (va dinh)))) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu va cac tu ((va thanh) OR (((va danh) OR (va dinh)))) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu va cac tu ((va thanh) or (((va danh) OR (va dinh)))) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va cac tu ((va thanh) or (((va danh) OR (va dinh)))) ki su triet*.