Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tang khoa » hang khoa, dang khoa, tang kha
hoc tang » hoc bang, hoc tan, hoc tieng
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
va nhan » van nhan, ca nhan, va phan
mo hoc » mon hoc, co hoc
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) or (thuoc sach)) hoc tap, nghien cuu mo hoc tang khoa hoc xa hoi va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) hoc tap, nghien cuu mo hoc tang khoa hoc xa hoi va nhan van.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) hoc tap, nghien cuu mo hoc tang khoa hoc xa hoi va nhan van*.