Perhaps you should try some spelling variations:
hoach hoc » hoach hoi, hoach hoa, cach hoc
cuu dong » cuu cong, cuu tong, cuu long
hanh hoa » thanh hoa, khanh hoa, hang hoa
hoi dang » hoi lang, hoi dong, hai dang
hang tai » hang va, dung tai
co hanh » co thanh, co phanh, co anh
hoi dan » hoa dan, hoc dan, hoi dap
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: thu hoach hoc tap, nghien cuu dong co hanh hoa hoc xa ((hoi dang) or (hoi dan)) hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hoach hoc tap, nghien cuu dong co hanh hoa hoc xa ((hoi dang) OR (hoi dan)) hang tai.
• Adding a wildcard symbol may retrieve word variants: thu hoach hoc tap, nghien cuu dong co hanh hoa hoc xa ((hoi dang) or (hoi dan)) hang tai*.