Perhaps you should try some spelling variations:
su sach » vu sach
va tinh » may tinh
hoc luc » hoc duc, hoc lua, coc luc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
luc va » duc va, tuc va, loc va
vi cua » vai cua
di cua » dai cua, doi cua, de cua
va hoc » van hoc

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