Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, kho tang, ky trong
tham so » tham do, than so, cham soc
ky dang » ky nang, ky danh
ha hoi » hoa hoi, ha noi, xa hoi
ham so » nam so, cham soc
di cua » dai cua, doi cua, de cua
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ((ky tang) or (ky dang)) ha hoi. hieu qua ((tham so) OR (ham so)) ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky tang) OR (ky dang)) ha hoi. hieu qua ((tham so) OR (ham so)) ban thanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ((ky tang) or (ky dang)) ha hoi. hieu qua ((tham so) OR (ham so)) ban thanh di cua tre*".