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
hieu va » lieu va, hieu qua
va danh » va dinh, va hanh, dia danh
va cau » van cau, va cac, va dau
cau tu » dau tu, cau truc
va dan » ca dan, va dao, va dau
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 cau tu ((va thanh) or (((va danh) OR (va dan)))) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x ho. hieu va cau tu ((va thanh) OR (((va danh) OR (va dan)))) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x ho. hieu va cau tu ((va thanh) or (((va danh) OR (va dan)))) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x ho. hieu va cau tu ((va thanh) or (((va danh) OR (va dan)))) ki su triet*.