Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
lam va » nam va, lam ha, am va
dam va » dam van, nam va, dam ha
x hoi » xa hoi, o hoi, x ho
thiet* » thieu*

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 x hoi. hieu ve chat ((xuc va) OR (luc va)) hanh ((lam va) or (dam va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu ve chat ((xuc va) OR (luc va)) hanh ((lam va) OR (dam va)) thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu ve chat ((xuc va) OR (luc va)) hanh ((lam va) or (dam va)) thiet*".