Perhaps you should try some spelling variations:
trinh thien » trinh thiet, trinh tien, trinh nghien
thien quan » trien quang, lien quan, thien van
dien phan » dien thanh, hien phap, dien dan
bien phap » ban phap
dinh cua » dinh cuu, sinh cua, dinh cu
viet nha » viet nhat, viet ha, viec nha
dan cua » dan ca, ban cua, dai cua
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 thien quan ((dan cua) or (dinh cua)) nguoi viet nha hoc ((dien phan) OR (bien phap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thien quan ((dan cua) OR (dinh cua)) nguoi viet nha hoc ((dien phan) OR (bien phap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thien quan ((dan cua) or (dinh cua)) nguoi viet nha hoc ((dien phan) OR (bien phap))".
• Adding a wildcard symbol may retrieve word variants: giao trinh thien quan ((dan cua) or (dinh cua)) nguoi viet nha hoc ((dien phan) OR (bien phap))*.