Perhaps you should try some spelling variations:
van giang » manh giang, tran giang, dan gian
giang dan » gian dan, giang day, giang van
toc sach » hoc sach, doc sach, thuoc sach
sach hoi » sach doi, sach moi, cach thoi
tan khoa » toan khoa, tran khoa, san khoa
khoa hoc » hoa hoc
hoi tap » hoi dap, hoc tap, hoi tai
hoc tan » hoc tang, hoc dan, hoc tap
hoi van » hoi va, hoi dan, hai van
cuu co » cua co, cuu mo, cu co
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 hoi tap, nghien ((cuu co) OR (huu co)) hoc tan khoa hoc xa hoi van giang dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach hoi tap, nghien ((cuu co) OR (huu co)) hoc tan khoa hoc xa hoi van giang dan".
• Adding a wildcard symbol may retrieve word variants: toc sach hoi tap, nghien ((cuu co) OR (huu co)) hoc tan khoa hoc xa hoi van giang dan*.