Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
cau treo » cau theo, cau tren, cau triet
cau nuoc » cap nuoc, cac nuoc, dau nuoc
hang hai » hoang hai, hang tai, thanh hai
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
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: su sach ky nang ((x hoi) OR (o hoi)). hieu van cau nuoc va ((nhanh thai) or (hang hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (o hoi)). hieu van cau nuoc va ((nhanh thai) OR (hang hai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) OR (o hoi)). hieu van cau nuoc va ((nhanh thai) or (hang hai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) OR (o hoi)). hieu van cau nuoc va ((nhanh thai) or (hang hai)) cau treo*.