Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
luu tre » luu tru, cuu tre, luy tre
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, duc va
ve luu » ke luu, vi luu
va cau » van cau, va cac, va dau
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ((o hoi) OR (o hai)). lieu va cau ((tuc va) or (tuc xa)) thanh ve luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((o hoi) OR (o hai)). lieu va cau ((tuc va) OR (tuc xa)) thanh ve luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((o hoi) OR (o hai)). lieu va cau ((tuc va) or (tuc xa)) thanh ve luu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((o hoi) OR (o hai)). lieu va cau ((tuc va) or (tuc xa)) thanh ve luu tre*.