Perhaps you should try some spelling variations:
trinh cua » trinh luat, trinh quan, trinh luan
thong tan » thong than, thong tran, thong tin
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, doi chieu
tinh cua » sinh cua, tinh chat, tranh cua
tan toan » tan tran, tap toan, van toan
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (ho chieu)) sach - hanh ((trinh cua) OR (tinh cua)) thong thong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (ho chieu)) sach - hanh ((trinh cua) OR (tinh cua)) thong thong tan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (ho chieu)) sach - hanh ((trinh cua) OR (tinh cua)) thong thong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) sach - hanh ((trinh cua) OR (tinh cua)) thong thong tan toan ban*.