Perhaps you should try some spelling variations:
thuat cach » thuat sach, thuat canh, thuat mach
nghien huu » nghien cuu, nguyen huu, nhiem huu
nhanh cong » nhanh chong, thanh cong, nganh cong
goc nhanh » hoc nhanh, doc nhanh, goc nhan
cong thuc » cong tac
thanh van » thanh toan, thanh phan, thanh nhan
cach hoc » cach thuc, cach thoi, dich hoc
huu mot » cuu mot, huy mot, hieu mot
thuc ma » thuoc ma, thuc va, thuc ha
hoa van » hoa dan, hoang van, hoa phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat cach hoc tap, nghien huu mot goc nhanh cong thuc ma hoa van ((thanh van) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat cach hoc tap, nghien huu mot goc nhanh cong thuc ma hoa van ((thanh van) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: thuat cach hoc tap, nghien huu mot goc nhanh cong thuc ma hoa van ((thanh van) or (thanh san))*.