Perhaps you should try some spelling variations:
canh thoi » cach thoi, hanh thoi, anh thi
cuu hoan » luu hoang, cuu van, cuu khoa
hoan hoc » hoa hoc, toan hoc, hoang hoa
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
thai van » thi van, thanh van, thai vung
van toan » van tuan, van tan, van thanh
toan tai » toan tap, doanh tai, toan ban
anh tho » anh khoa, anh thuc
xa thai » ca thai, a thai, da thai
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: thu ((canh thoi) or (anh tho)) dai, nghien cuu hoan hoc dan khoa hoc xa thai van toan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((canh thoi) OR (anh tho)) dai, nghien cuu hoan hoc dan khoa hoc xa thai van toan tai.
• Adding a wildcard symbol may retrieve word variants: thu ((canh thoi) or (anh tho)) dai, nghien cuu hoan hoc dan khoa hoc xa thai van toan tai*.