Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
gian lang » gian dan
toc sach » hoc sach, doc sach, thuoc sach
khoa hoc » hoa hoc
doi tac » dong tac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va gian » va gianh, van gian, va giai
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 (thuat sach)) doi tac, nghien cuu mon hoc nganh khoa hoc ma hoi va gian lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) doi tac, nghien cuu mon hoc nganh khoa hoc ma hoi va gian lang.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) doi tac, nghien cuu mon hoc nganh khoa hoc ma hoi va gian lang*.