Perhaps you should try some spelling variations:
dung khoa » dung cho
sach hoc » cach hoc, sach hoi, mach hoc
dong hoc » dong luc
khoa hoc » hoa hoc
dan phan » doan phan, dan chan, van phan
vu sach » vu bach, su sach, vu khach
hoi dan » hoa dan, hoc dan, hoi dap
phan va » phan van, nhan va, han va
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: vu sach hoc tap, nghien cuu ((dong hoc) OR (dong co)) dung khoa hoc xa hoi dan phan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach hoc tap, nghien cuu ((dong hoc) OR (dong co)) dung khoa hoc xa hoi dan phan va".
• Adding a wildcard symbol may retrieve word variants: vu sach hoc tap, nghien cuu ((dong hoc) OR (dong co)) dung khoa hoc xa hoi dan phan va*.