Perhaps you should try some spelling variations:
thuat sach » thuat lanh
thuat san » thuat toan, thuat song, thuat lanh
minh tri » dinh tri, chinh tri, minh thu
mang xa » mang may, dang xay, mang cua
lang xa » lang ha, dang xay, lang van
hieu ha » hieu hoa, hieu va, hieu ca
va minh » van minh, vua minh, va kinh
cua tre » cua te, cuu tre, cua triet
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) OR (thuat san)) y ((mang xa) or (lang xa)) hoi. hieu ha nam tu va minh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat san)) y ((mang xa) OR (lang xa)) hoi. hieu ha nam tu va minh tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) OR (thuat san)) y ((mang xa) or (lang xa)) hoi. hieu ha nam tu va minh tri cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) OR (thuat san)) y ((mang xa) or (lang xa)) hoi. hieu ha nam tu va minh tri cua tre*.