Perhaps you should try some spelling variations:
hoa thanh » hoan thanh, ha thanh, hoc thanh
than phan » thanh phan, toan phan, thanh pham
cong coc » cong cuoc, cong cac, cong co
hai than » hai thanh, hai tan, hai phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoc tap, hoi tai
hoc tai » hoc dai, hoc tap, hoc bai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoa » mon hoc, dong hoa, cong hoa
coc ma » hoc ma, co ma, coc ha
ma hai » ta hai, va hai, xa hai

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