Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
x hoi » xa hoi, o hoi, x ho

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. hieu ((van cau) OR (van hau)) nuoc va ((nhanh thai) or (hoang thi)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((van cau) OR (van hau)) nuoc va ((nhanh thai) OR (hoang thi)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((van cau) OR (van hau)) nuoc va ((nhanh thai) or (hoang thi)) cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((van cau) OR (van hau)) nuoc va ((nhanh thai) or (hoang thi)) cau treo*.