Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
pham duy » pham duc
so sach » bo sach, co sach, hoc sach
cua tre » cua te, cua triet, dua tren
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
so sanh » do sanh
cuu tre » cau tren, cau treo
duy va » duy vat, duy van, day va

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 (so sanh)) ty nang xa hoi. hieu vu pham duy va doanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ty nang xa hoi. hieu vu pham duy va doanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ty nang xa hoi. hieu vu pham duy va doanh tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ty nang xa hoi. hieu vu pham duy va doanh tai ((cua tre) or (cuu tre))*.