Perhaps you should try some spelling variations:
ban thanh » ban hanh
qua tham » qua cham, qua than, qua thanh
ban hang » ngan hang
tham so » ham so, tham do, than so
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
hoa doi » hoa dai, hoc doi, xoa doi
hoa hoi » khoa hoi, hoa hoc, hoc hoi
vi cua » vai cua, di cua
te cao » te bao

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

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