Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet qua » thien quan, hieu qua, thien quy
hoc dien » hoc hien, hoc vien, hoc dieu
dien dan » hien dai, vien dai, gian dan
qua dan » qua danh, qua ban, cua dan
dan cua » dan ca, ban cua, dai cua
viet va » viet van, viet ha, tiet va
va hoc » van 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 dan cua nguoi viet va hoc dien dan~.
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet qua dan cua nguoi viet va hoc dien dan*.