Perhaps you should try some spelling variations:
thanh trung » thanh tung
thuong dan » huong dan, thuong dam, thuong lan
thuong han » thuong mai, thuong va, thuong gap
hoc thieu » toc thieu
trung cap » truong cao, trung tam
cap dang » cao dang, cac dang, cap bang
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: ((hoc hien) or (hoc thieu)) sach - thanh trung cap dang ((thuong dan) OR (thuong han)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (hoc thieu)) sach - thanh trung cap dang ((thuong dan) OR (thuong han)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (hoc thieu)) sach - thanh trung cap dang ((thuong dan) OR (thuong han)) toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (hoc thieu)) sach - thanh trung cap dang ((thuong dan) OR (thuong han)) toan ban*.