Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu
hanh tinh » nhanh tinh, thanh tinh, canh tinh
chat hang » chat quang, chat chong, chat phong
hang cong » dang cong, hang nong, bang cong
ban thanh » ban hanh, ban hang
cong ban » cong bang, cong san, cong tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (hoc hien)) sach - ((hanh tinh) OR (hanh trinh)) chat hang cong ban thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (hoc hien)) sach - ((hanh tinh) OR (hanh trinh)) chat hang cong ban thanh san.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (hoc hien)) sach - ((hanh tinh) OR (hanh trinh)) chat hang cong ban thanh san".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (hoc hien)) sach - ((hanh tinh) OR (hanh trinh)) chat hang cong ban thanh san*.