Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ban banh » ban hanh, ban anh, ban danh
sang mai » sang ma, sang tai, lang mai
tu sach » su sach, te sach, tu cach
banh di » danh di, xanh di, banh chi
xuc ban » duc ban, cuc ban, quoc ban
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
di cua » dai cua, doi cua, de cua

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) OR (thu sach)) ky sang mai hoi. ((lieu va) or (hieu va)) cam xuc ban banh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky sang mai hoi. ((lieu va) OR (hieu va)) cam xuc ban banh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky sang mai hoi. ((lieu va) or (hieu va)) cam xuc ban banh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky sang mai hoi. ((lieu va) or (hieu va)) cam xuc ban banh di cua tre*.