Perhaps you should try some spelling variations:
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
cuu phan » cuu phat, cuu nhan, uu phan
phan van » pham van, thanh van, luan van
cuu mot » cua mot, cuu mo, huu mot
hoc mac » hoc ma, hoc may, hoc cac
hoc da » hoc dan, hoc dai, hoc dat
mac ho » bac ho, cac ho, mau ho
ho cuu » ho chu, ho cua, so cuu

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) or (cuu mot)) hoc da khoa hoc mac ho cuu phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien ((cuu cong) OR (cuu mot)) hoc da khoa hoc mac ho cuu phan van.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien ((cuu cong) or (cuu mot)) hoc da khoa hoc mac ho cuu phan van*.