Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
dang khoa » dung khoa, hang khoa, dang khoi
hoc dang » hoc dan, hoc dung, hoc bang
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 dang khoa hoc xa hoi va nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) OR (thuoc sach)) hoc tap, nghien cuu mo hoc dang 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 dang khoa hoc xa hoi va nhan van*.