Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
y nang » ky nang, ly nang, v nang
di cau » diem cau
da cau » dat cau, va cau

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 y nang cau hoi. hieu va cac duc va thanh ((di cau) or (da cau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cau hoi. hieu va cac duc va thanh ((di cau) OR (da cau)) treo.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cau hoi. hieu va cac duc va thanh ((di cau) or (da cau)) treo*.