Perhaps you should try some spelling variations:
sang thanh » dang thanh, sang than, tang thanh
thanh van » thanh san, thanh toan, thanh phan
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
luc sang » lam sang, luc canh, duy sang
bao luc » bao thuc
van bao » van ban, van dao
su sach » so sach, vu sach
van cau » van dau, van hau, van chat
tu sach » thu sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) y nang ((x hoi) or (o hoi)). hieu van bao luc sang thanh van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ((x hoi) OR (o hoi)). hieu van bao luc sang thanh van cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) y nang ((x hoi) or (o hoi)). hieu van bao luc sang thanh van cau tren*.