Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
su sach » so sach, vu sach
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
vi va » vi van, vai va, vu va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang x ho. lieu va cam xuc ((va thanh) or (((van hanh) OR (ban hanh)))) vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x ho. lieu va cam xuc ((va thanh) OR (((van hanh) OR (ban hanh)))) vi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x ho. lieu va cam xuc ((va thanh) or (((van hanh) OR (ban hanh)))) vi va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x ho. lieu va cam xuc ((va thanh) or (((van hanh) OR (ban hanh)))) vi va thiet*.