Perhaps you should try some spelling variations:
trinh nhiet » trinh nghien, trinh viet, trinh triet
trinh thiet » trinh viet, trinh thi
luan danh » luan thanh, luan nang, luan san
cho nguoi » cua nguoi
hoc tieng » hoc hien
viet nha » viet nhat, viet ha, viec nha
nha hoc » nha thuoc, khoa hoc, nha nuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao ((trinh nhiet) or (trinh thiet)) ((luan danh) OR (luan van)) cho nguoi viet nha hoc tieng anh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao ((trinh nhiet) OR (trinh thiet)) ((luan danh) OR (luan van)) cho nguoi viet nha hoc tieng anh.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao ((trinh nhiet) or (trinh thiet)) ((luan danh) OR (luan van)) cho nguoi viet nha hoc tieng anh".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh nhiet) or (trinh thiet)) ((luan danh) OR (luan van)) cho nguoi viet nha hoc tieng anh*.