Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
mach thoi » cach thoi, cac thoi, sach hoi
goc nganh » hoc nganh, cac nganh, moi nganh
hoc nhanh » hoc nganh, hoc phan
danh nhan » doanh nhan, thanh nhan, benh nhan
thoi tap » toi tap, hoc tap, thoi dai
hoi danh » hop danh, hoi dan, hoc danh
nhan tai » hang tai, van tai, toan tai
cuu mot » cua mot, cuu mo, huu mot
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat mach thoi tap, nghien cuu mot ((goc nganh) or (hoc nhanh)) hoa hoc ma hoi danh nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach thoi tap, nghien cuu mot ((goc nganh) OR (hoc nhanh)) hoa hoc ma hoi danh nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat mach thoi tap, nghien cuu mot ((goc nganh) or (hoc nhanh)) hoa hoc ma hoi danh nhan tai*.