Perhaps you should try some spelling variations:
hoc thanh » hoc nhanh, hoan thanh, hoc phan
cong hoc » dong hoc, cong hoa, cong coc
chai van » chi van, thai van, hai van
van pham » san pham, van phan, van phat
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
va chai » va cai, va chat, va cham

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 chai van pham 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 chai van pham van.
• Adding a wildcard symbol may retrieve word variants: tu sach ((hoi dap) or (hoc tai)), nghien cuu mon hoc thanh cong hoc va chai van pham van*.