Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
trung cao » truong cao, trung cap, trung co
trong dan » trong dang, trong san, trong ban
trong tan » trong quan, trong cac, trong ca
cao dung » cao dang, cao dong, cao ung
toan cao » toan ban, toan tap

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 sach) or (hieu lang)) - hanh trung cao dung ((trong dan) OR (trong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (hieu lang)) - hanh trung cao dung ((trong dan) OR (trong tan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (hieu lang)) - hanh trung cao dung ((trong dan) OR (trong tan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (hieu lang)) - hanh trung cao dung ((trong dan) OR (trong tan)) toan cao*.