Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
va chai » va cai, va chat, va cham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
chai o » thai o, chi o, chai lao
va cuu » va cau, va chu
va huu » vu huu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu va chai o ((va hanh) or (va thanh)) ((va cuu) or (va huu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va chai o ((va hanh) OR (va thanh)) ((va cuu) OR (va huu)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va chai o ((va hanh) or (va thanh)) ((va cuu) or (va huu)) tre*.