Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc cach » hoc cac, cuoc cach, hoc cao
hoc sach » hoc sinh, hoc cac, hoc anh
cong hoc » dong hoc, cong hoa, cong coc
hoc hang » hoc hanh, hoc bang, hoc tang
hang hoa » hang khoa, thanh hoa, hang va
gian dan » gian lang
va gian » va gianh, van gian, va giai
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) OR (hoc sach)) thuc vat, nghien cua cong hoc hang hoa hoc xa hoi va gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc cach) OR (hoc sach)) thuc vat, nghien cua cong hoc hang hoa hoc xa hoi va gian dan".
• Adding a wildcard symbol may retrieve word variants: ((hoc cach) OR (hoc sach)) thuc vat, nghien cua cong hoc hang hoa hoc xa hoi va gian dan*.