Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hieu va » hieu qua
xa dung » xay dung, xa dong, va dung
dung co » dung cho, dung cong, dung cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cam tu » cam thu, nam tu, dam tu
co cua » con cua, ca cua, cong cua
x hoi » o hoi, x ho, 5 hoi
tu xa » tu xay, tu va, te xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y nang ((x hoi) or (xa hoi)). ((hieu va) or (lieu va)) cam tu xa dung co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang ((x hoi) OR (xa hoi)). ((hieu va) OR (lieu va)) cam tu xa dung co cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang ((x hoi) or (xa hoi)). ((hieu va) or (lieu va)) cam tu xa dung co cua tre*.