Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
dung khoa » dung cho
thoi dai » hoc dai, hoi dap, hoi dan
hoc dung » hoc ung, hoc dan, tac dung
khoa hoc » hoa hoc
te cach » ve cach, te sach, tu cach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va phan » van phan, va phat, hoa phan
va phap » va phat, ban phap
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: te cach thoi dai, nghien cuu mon hoc dung khoa hoc xa hoi ((va phan) OR (va phap)) dang~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach thoi dai, nghien cuu mon hoc dung khoa hoc xa hoi ((va phan) OR (va phap)) dang".
• Adding a wildcard symbol may retrieve word variants: te cach thoi dai, nghien cuu mon hoc dung khoa hoc xa hoi ((va phan) OR (va phap)) dang*.