Perhaps you should try some spelling variations:
trinh nhiet » trinh thiet, trinh nghien, trinh viet
trinh hieu » trinh dieu, trinh thiet, trinh thien
cho nguoi » cua nguoi
hoc tieng » hoc hien
qua danh » luan danh, luat danh, quoc danh
viet nma » viet nm, viet nami, viet nhat
qua dan » qua ban, cua dan, mua dan
nma hoc » nha hoc, nhan hoc

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 hieu) or (trinh nhiet)) ((qua danh) OR (qua dan)) cho nguoi viet nma hoc tieng anh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao ((trinh hieu) OR (trinh nhiet)) ((qua danh) OR (qua dan)) cho nguoi viet nma hoc tieng anh.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao ((trinh hieu) or (trinh nhiet)) ((qua danh) OR (qua dan)) cho nguoi viet nma hoc tieng anh".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh hieu) or (trinh nhiet)) ((qua danh) OR (qua dan)) cho nguoi viet nma hoc tieng anh*.