Perhaps you should try some spelling variations:
vung thanh » vuong thanh, vung nhanh, dung thanh
thai vung » thai cong, thai van
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
so doanh » so danh, su doanh, hoa doanh
cong so » cong san, cong hoa
ma thai » mai thai, mau thai, ca thai

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 cuu cong so doanh ((khoa hoc) OR (hoa hoc)) ma thai vung thanh pho~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu cong so doanh ((khoa hoc) OR (hoa hoc)) ma thai vung thanh pho".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu cong so doanh ((khoa hoc) OR (hoa hoc)) ma thai vung thanh pho*.