Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
hoc thanh » hoc nhanh, hoc phan, ha thanh
sach hoc » cach hoc, sach hoi, mach hoc
van nhan » van phan, van thanh, danh nhan
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
hoi van » hoi va, hoi dan, hai van
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 ((hoc thanh) or (hoan thanh)) hoa hoc xa hoi van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tai, nghien cuu mon ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi van nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tai, nghien cuu mon ((hoc thanh) or (hoan thanh)) hoa hoc xa hoi van nhan dan*.