Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
canh thoi » hanh thoi, anh tho, anh thi
cach thoi » cac thoi, cach thuc, cach noi
khoa phan » hoa phan, khoa than, khoa phau
cuu toan » cuu hoan, cua toan, huu toan
chong do » chong doc, cuong do, chong co
nhan tai » hang tai, van tai, toan tai
va nhan » van nhan, ca nhan, va phan
do xa » doi xa, do va, o xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve ((canh thoi) OR (cach thoi)) tap, nghien cuu toan khoa phan chong do xa hoi va nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ve ((canh thoi) OR (cach thoi)) tap, nghien cuu toan khoa phan chong do xa hoi va nhan tai".
• Adding a wildcard symbol may retrieve word variants: ve ((canh thoi) OR (cach thoi)) tap, nghien cuu toan khoa phan chong do xa hoi va nhan tai*.