Perhaps you should try some spelling variations:
khoa thong » hoa thong, thoai thong, pho thong
mach diem » mach dien, mach dieu, dac diem
diem thuc » kien thuc, den thuc, dinh thuc
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
thuc hach » thuc hanh, chuc hach, thuc cach
hach toan » thanh toan, manh toan
toan tai » toan tap, doanh tai, toan ban
su mach » su sach
su cach » su sach, tu cach, su cac
trung » truong, trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su mach diem thuc bach khoa khoa thong ) or ( su cach thuc thuc hach toan tai trung ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su mach diem thuc bach khoa khoa thong ) OR ( su cach thuc thuc hach toan tai trung )).
• Adding a wildcard symbol may retrieve word variants: (( su mach diem thuc bach khoa khoa thong ) or ( su cach thuc thuc hach toan tai trung ))*.