Perhaps you should try some spelling variations:
nhanh chong » thanh cong, khanh phong
canh chong » manh cuong, anh thong, hanh cong
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
van phan » van phong, van thanh, luan phan
phan dan » phan dang, phan dau, nhan dan
tu sach » thu sach, su sach, te sach
hoi van » hoi va, hoi dan, hai van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu dong luc ((canh chong) or (nhanh chong)) hoc ma hoi van phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong luc ((canh chong) OR (nhanh chong)) hoc ma hoi van phan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong luc ((canh chong) or (nhanh chong)) hoc ma hoi van phan dan*.