Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
thu nhat » thu nhap, thu thuat, thu ha
hieu ha » hieu hoa, hieu va, hieu ca
sai cua » dai cua, hai cua, lai cua
thu nam » tu nam, thu nhap, thu ngan
tu sach » thu sach, te sach, tu cach
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 (su sach)) ky sang ma hoi. hieu ha nam ((thu nam) OR (thu nhat)) danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky sang ma hoi. hieu ha nam ((thu nam) OR (thu nhat)) danh sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky sang ma hoi. hieu ha nam ((thu nam) OR (thu nhat)) danh sai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky sang ma hoi. hieu ha nam ((thu nam) OR (thu nhat)) danh sai cua tre*.