Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
so nganh » so ngan, hoc nganh, moi nganh
mac tang » mach tiang, bac thang, dac thang
tang van » dang van, hoang van, trong van
hanh hai » thanh hai, nhanh hai, hang hai
van hoe » van hoa, van hoc, van hieu
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so nganh mac tang van hoe. ((hieu hien) or (dieu hien)) cac duc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so nganh mac tang van hoe. ((hieu hien) OR (dieu hien)) cac duc va hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: so nganh mac tang van hoe. ((hieu hien) or (dieu hien)) cac duc va hanh hai cua tre*.