Perhaps you should try some spelling variations:
canh thoi » cach thoi, hanh thoi, anh tho
thu canh » thuc hanh, thu cong, thu ban
thoi dai » hoc dai, hoi dap, hoi dan
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, tin hoc
tan nhan » tran nhan, tao nhan, van nhan
nhan tai » hang tai, van tai, toan tai
hai tan » hai van, hai quan
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu canh thoi dai, nghien cuu toan hoc dan ((khoa hoc) OR (hoa hoc)) xa hai tan nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu canh thoi dai, nghien cuu toan hoc dan ((khoa hoc) OR (hoa hoc)) xa hai tan nhan tai".
• Adding a wildcard symbol may retrieve word variants: thu canh thoi dai, nghien cuu toan hoc dan ((khoa hoc) OR (hoa hoc)) xa hai tan nhan tai*.