Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
ban thanh » ban hanh, ban hang
sach hoc » cach hoc, sach hoi, mach hoc
van phan » van phong, van thanh, luan phan
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
hoc bai » hoc dai, hoc giai
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 bai, nghien cuu mon ((hoc thanh) or (ban thanh)) hoa hoc xa hoi van phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc bai, nghien cuu mon ((hoc thanh) OR (ban thanh)) hoa hoc xa hoi van phan dau.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc bai, nghien cuu mon ((hoc thanh) or (ban thanh)) hoa hoc xa hoi van phan dau*.