Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh cong » nhanh chong, thanh cong
luc nganh » luc ngan, chuc nganh, luat nganh
sach doi » sach hoi, sach moi, sach dao
cong luc » dong luc, cong suc, cong duc
cong hoc » dong hoc, cong hoa, cong coc
toan tai » toan tap, doanh tai, toan ban
te sach » toc sach
doi tap » doi tac, doi dap, doi tai
ca toan » cua toan, va toan, bai toan
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach doi tap, nghien thu cong luc nganh cong hoc ((ma hoi) or (ma hoa)) ca toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach doi tap, nghien thu cong luc nganh cong hoc ((ma hoi) OR (ma hoa)) ca toan tai.
• Adding a wildcard symbol may retrieve word variants: te sach doi tap, nghien thu cong luc nganh cong hoc ((ma hoi) or (ma hoa)) ca toan tai*.