Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
hang tai » hang va, dung tai
cau chuc » cau chu, cau phuc, canh chuc
tai cua » thai cua, tai cuc, tri cua
va hang » van hang, va nang, va lang
chuc va » thuc va, thuc vat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky sang ((ma hoi) OR (xa hoi)). ((hieu ve) or (thien van)) cau chuc va hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky sang ((ma hoi) OR (xa hoi)). ((hieu ve) OR (thien van)) cau chuc va hang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky sang ((ma hoi) OR (xa hoi)). ((hieu ve) or (thien van)) cau chuc va hang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky sang ((ma hoi) OR (xa hoi)). ((hieu ve) or (thien van)) cau chuc va hang tai cua tre*.