Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
sach ty » sach y, sach tu, sach thu
va tinh » may tinh
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, vu dinh
cac lo » cac lop, cac co, cac bo
ve cac » va cac, vien cac
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: su sach ty nang cau hoi. hieu ve cac lo ((va dinh) OR (va tinh)) ((va cua) or (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cau hoi. hieu ve cac lo ((va dinh) OR (va tinh)) ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang cau hoi. hieu ve cac lo ((va dinh) OR (va tinh)) ((va cua) or (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cau hoi. hieu ve cac lo ((va dinh) OR (va tinh)) ((va cua) or (ca cua)) triet*.