Perhaps you should try some spelling variations:
giao tinh » gia tinh, giao thanh, giao tiep
nha thuoc » nha nuoc, nhan thuc, nha hoc
qua danh » qua dan, luan danh, luat danh
danh cua » doanh cua, manh cua, dinh cua
viet nha » viet nhat, viet ha, viec nha
tren han » tren phan, tren san, tieng han
tran han » tran hanh, tran hoan, tran nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((giao tinh) or (giao trinh)) hieu qua danh cua nguoi viet nha thuoc ((tren han) OR (tran han))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((giao tinh) OR (giao trinh)) hieu qua danh cua nguoi viet nha thuoc ((tren han) OR (tran han))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((giao tinh) or (giao trinh)) hieu qua danh cua nguoi viet nha thuoc ((tren han) OR (tran han))*".