Perhaps you should try some spelling variations:
trinh thi » trinh tai, dinh thi, trinh tu
hien nhan » hien nhanh, thien nhan, dien nhan
dua danh » dia danh, qua danh, dung danh
cu nguoi » cua nguoi, chu nguoi, ca nguoi
thi dua » thi dung
danh cu » danh cau, danh tu, dinh cu
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 thi dua danh cu nguoi viet ha hoc hien nhan~.
• Adding a wildcard symbol may retrieve word variants: giao trinh thi dua danh cu nguoi viet ha hoc hien nhan*.