Perhaps you should try some spelling variations:
thuong phan » thuong han, thong phan, huong phan
phan thuong » hang thuong, phan xuong
hoc phan » hoc dan, hoc pho
tap toan » tap doan, tap quan, bai toan
toan tai » toan tap, doanh tai, toan ban
tu mach » tu cach, tu manh, tu sach
tu hach » tu hanh, tu cach, tu sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
phan ha » phan hoa, phan ba, phan h
hoi tap » hoi dap, hoi tai, hai tap
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu mach) OR (tu hach)) hoc tap, nghien cuu mot hoc phan thuong phan ha hoi tap toan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu mach) OR (tu hach)) hoc tap, nghien cuu mot hoc phan thuong phan ha hoi tap toan tai*".