Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
cach thuc » anh thuc, cac thu
hoc cach » hoc cac, hoc sach, cuoc cach
coc hang » oc hang, moc hoang, cua hang
hoc hang » hoc hanh, hoc bang, hoc tang
nhan dan » phan dau, gian dan, nhan tai
va nhan » van nhan, ca nhan, va phan
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc cach thuc vat, nghien cua cong ((coc hang) OR (hoc hang)) hoa hoc xa hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc cach thuc vat, nghien cua cong ((coc hang) OR (hoc hang)) hoa hoc xa hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: hoc cach thuc vat, nghien cua cong ((coc hang) OR (hoc hang)) hoa hoc xa hoi va nhan dan*.