Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghiep vu » nghiep va
toc sach » hoc sach, doc sach, nuoc sach
dan nhan » danh nhan, dan chan, van nhan
dan hoa » danh hoa, dan hoat, dan khoa
hoi dan » hoc dan, hoi dap, thoi dai
nhan va » nhan tai, nhan dan, nhan tao
vu van » tu van
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: ((toc sach) OR (thuoc sach)) hoc tap, nghiep vu van hoa dan hoa hoc xa hoi dan nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) hoc tap, nghiep vu van hoa dan hoa hoc xa hoi dan nhan va".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) hoc tap, nghiep vu van hoa dan hoa hoc xa hoi dan nhan va*.