Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hoan thanh » hoang thanh, ban thanh, van thanh
dong hoan » dong hoa, cong hoan, dang hoang
cuu dong » cuu cong, cuu tong, cuu long
cong hoc » dong hoc, cong hoa, cong coc
van luan » van quan, van tuan, von luan
hoi tai » hoi trac
hoc tai » hoc dai, hoc tap, hoc bai
hai van » thai van, ha van, hai tan
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: thuoc sach ((hoi tai) or (hoc tai)), nghien cuu dong hoan thanh cong hoc ma hai van luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((hoi tai) OR (hoc tai)), nghien cuu dong hoan thanh cong hoc ma hai van luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((hoi tai) or (hoc tai)), nghien cuu dong hoan thanh cong hoc ma hai van luan van*.