Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
danh va » doanh va, hanh va, anh va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
le va » te va, ly va, ke va

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