Perhaps you should try some spelling variations:
su sach » so sach
hanh ki » hanh vi, hanh ky, hanh kien
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
hieu va » lieu va, hieu qua
vu sach » vu bach, vu khach
su viet » so viet
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho
ki su » ky su

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 (vu sach)) v nang x hoi. hieu va cam ((xuc van) or (luc van)) hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v nang x hoi. hieu va cam ((xuc van) OR (luc van)) hanh ki su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) v nang x hoi. hieu va cam ((xuc van) or (luc van)) hanh ki su viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) v nang x hoi. hieu va cam ((xuc van) or (luc van)) hanh ki su viet*.