Perhaps you should try some spelling variations:
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
cac thoi » cac toi, cac hop, cac tro
pho cua » cho cua, kho cua, tho cua
thoi va » hoi va, thai va, tho va
hieu va » lieu va, hieu qua
so sach » so sanh, co sach, hoc sach
nang xa » nang x, lang xa, nang ma
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) ky ((nang xa) or (dang xay)) hoi. hieu va cac thoi va thanh pho cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ky ((nang xa) OR (dang xay)) hoi. hieu va cac thoi va thanh pho cua tre.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ky ((nang xa) or (dang xay)) hoi. hieu va cac thoi va thanh pho cua tre*.