Perhaps you should try some spelling variations:
ban hanh » ban hang
trung ha » trung hoc, trung tam, trung cap
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, tang van
sac ke » tac ke, sac ky, cac ke
di cua » dai cua, doi cua, de cua
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ke ((tang ha) OR (trung ha)) hoi. ((hieu ve) or (lieu va)) lam duc ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ke ((tang ha) OR (trung ha)) hoi. ((hieu ve) OR (lieu va)) lam duc ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ke ((tang ha) OR (trung ha)) hoi. ((hieu ve) or (lieu va)) lam duc ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ke ((tang ha) OR (trung ha)) hoi. ((hieu ve) or (lieu va)) lam duc ban hanh di cua tre*.