Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach hoc » cach hoc, sach hoi, mach hoc
ha thanh » va thanh, pham thanh, phan thanh
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
hoc tai » hoc dai, hoc tap, hoc bai
cuu mon » cuu mo, cuu mot, cuu cong
va nhan » van nhan, ca nhan, va phan
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: tu sach hoc tai, nghien cuu mon ((ha thanh) or (van thanh)) hoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tai, nghien cuu mon ((ha thanh) OR (van thanh)) hoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tai, nghien cuu mon ((ha thanh) or (van thanh)) hoa hoc xa hoi va nhan dan*.