Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va danh » va dinh, va hanh, dia danh
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
ca cuu » cua cuu, ca cua, ca cau

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 mai hoi. hieu va cac du ((va danh) OR (va dan)) ((ca cuu) or (cap cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang mai hoi. hieu va cac du ((va danh) OR (va dan)) ((ca cuu) OR (cap cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang mai hoi. hieu va cac du ((va danh) OR (va dan)) ((ca cuu) or (cap cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang mai hoi. hieu va cac du ((va danh) OR (va dan)) ((ca cuu) or (cap cuu)) tre*.