Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
danh khoa » doanh khoa, anh khoa, danh hoa
van thanh » ban thanh
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
van tuan » van quan, van ban, anh tuan
cong so » cong san, cong hoa
so danh » do danh, so sanh, so dan
da thai » dao thai, do thai, ca thai
hoc da » hoc dan, hoc dai, hoc dat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu mach hoc tap, nghien thu cong so danh khoa hoc da thai ((van thanh) or (van tuan)) san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien thu cong so danh khoa hoc da thai ((van thanh) OR (van tuan)) san.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien thu cong so danh khoa hoc da thai ((van thanh) or (van tuan)) san*.