Perhaps you should try some spelling variations:
canh thoi » hanh thoi, anh tho, anh thi
cach thoi » cac thoi, cach thuc, cach noi
danh nhan » doanh nhan, thanh nhan, benh nhan
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
hai danh » thai danh, hai anh, hai dang
nhan tai » hang tai, van tai, toan tai
hoc xa » hoc ma
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) OR (cach thoi)) dai, nghien cuu toan hoc dan khoa hoc xa hai danh nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((canh thoi) OR (cach thoi)) dai, nghien cuu toan hoc dan khoa hoc xa hai danh nhan tai".
• Adding a wildcard symbol may retrieve word variants: thu ((canh thoi) OR (cach thoi)) dai, nghien cuu toan hoc dan khoa hoc xa hai danh nhan tai*.