Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
van anh » van thanh, tuan anh, van minh
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
va cua » va chua, via cua, ma cua
ca cua » co cua

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) OR (su sach)) ty nang cau hoi. hieu va cac lo van anh ((va cua) or (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang cau hoi. hieu va cac lo van anh ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang cau hoi. hieu va cac lo van anh ((va cua) or (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang cau hoi. hieu va cac lo van anh ((va cua) or (ca cua)) triet*.