Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
nang dau » hang dau, xang dau, nang du
sach ky » sac ky, sach ty, sach kem
tai cua » thai cua, tai cuc, tri cua
va hang » van hang, va nang, va lang
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dau hoi » cau hoi, dai hoi, dan 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) or (sach y)) nang dau hoi. hieu ve ((cau luc) or (cam xuc)) va hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang dau hoi. hieu ve ((cau luc) OR (cam xuc)) va hang tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) nang dau hoi. hieu ve ((cau luc) or (cam xuc)) va hang tai cua tre*.