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
coc tuc » coc luc, hoc thuc, doc thuc
va tinh » may tinh
va coc » va cuoc, va cac, va hoc
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (su sach)) ky nang xa hoi. hieu va coc tuc va tinh ((va cua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (su sach)) ky nang xa hoi. hieu va coc tuc va tinh ((va cua) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (su sach)) ky nang xa hoi. hieu va coc tuc va tinh ((va cua) or (ca cua)) tre*.