Perhaps you should try some spelling variations:
qua cham » qua cac, va cham, qua cua
vanh dai » van dai, vanh tai, lanh dao
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
qua hai » qua hoat
va vanh » va van, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky lang) or (ky tang)) xa hoi. hieu ((qua cham) OR (qua hai)) xuc va vanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu ((qua cham) OR (qua hai)) xuc va vanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) or (ky tang)) xa hoi. hieu ((qua cham) OR (qua hai)) xuc va vanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky tang)) xa hoi. hieu ((qua cham) OR (qua hai)) xuc va vanh dai cua tre*.