Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va tinh » may tinh
y nang » ky nang, ly nang, v nang
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
da va » dia va, do va, ca va
so va » so van, so vat, su va

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 y nang xa hoi. hieu va cau luc va tinh ((da va) or (so va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu va cau luc va tinh ((da va) OR (so va)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va cau luc va tinh ((da va) or (so va)) triet*.