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