Perhaps you should try some spelling variations:
trien nhan » trien nha, tri nhan, trien khai
thiet qua » thien quan, thien quy, khien qua
hoc trien » hoc tren, hoc tien, hoc truyen
dinh cua » dinh cuu, dinh cu, tinh cua
sinh cua » manh cua, dinh cuu, sinh va
viet ha » viet nam
ha hoc » hoa hoc, nha hoc, va 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 ((thiet qua) or (hieu qua)) ((dinh cua) OR (sinh cua)) nguoi viet ha hoc trien nhan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh ((thiet qua) OR (hieu qua)) ((dinh cua) OR (sinh cua)) nguoi viet ha hoc trien nhan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh ((thiet qua) or (hieu qua)) ((dinh cua) OR (sinh cua)) nguoi viet ha hoc trien nhan".
• Adding a wildcard symbol may retrieve word variants: giao trinh ((thiet qua) or (hieu qua)) ((dinh cua) OR (sinh cua)) nguoi viet ha hoc trien nhan*.