Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
van phong » van dong, hai phong
phong van » phung van, thong van, phong va
cong hoc » dong hoc, cong hoa, cong coc
tu sach » thu sach, su sach, te sach
hoc tai » hoc dai, hoc tap, hoc bai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hai van » thai van, ha van, hai tan
va hai » van hai, va chai, va khai

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 ((hoi dap) or (hoc tai)), nghien cuu mon hoc thanh cong hoc va hai van phong van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((hoi dap) OR (hoc tai)), nghien cuu mon hoc thanh cong hoc va hai van phong van.
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi dap) or (hoc tai)), nghien cuu mon hoc thanh cong hoc va hai van phong van*.