Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
phap dau » phan dau, phap day, pham dau
doi tap » doi tac, doi dap, doi tai
va phap » va phat, ban phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (doc sach)) doi tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) doi tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) doi tap, nghien cuu cong hoc nganh khoa hoc ma hoi va phap dau*.