Perhaps you should try some spelling variations:
hanh trinh » canh tranh
thong viet » thuong viet, tieng viet
hoc chieu » hoc thieu, hoc hien, hoc dieu
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, doi chieu
viet hap » viet phap, viet ha, viet gap
hap ban » lap ban, hap dan, nhat ban

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

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