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

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) or (te cao)) ((ky tang) OR (kho tang)) ha hoi. hieu qua tham so ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (te cao)) ((ky tang) OR (kho tang)) ha hoi. hieu qua tham so ban hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) or (te cao)) ((ky tang) OR (kho tang)) ha hoi. hieu qua tham so ban hanh di cua tre*".