Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong tham » chong tham, cong thai, hong tham
tham hang » pham hang, thai hang, tham lang
hang cong » dang cong, hang nong, bang cong
hieu van » hieu va, thien van, lieu va
cong san » cong tac
san hang » san chang, ban hang, van hang
hang ca » hang va, nang cao, hang tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu van) OR (chieu sach)) - thanh cong tham hang cong san hang ca~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu van) OR (chieu sach)) - thanh cong tham hang cong san hang ca".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu van) OR (chieu sach)) - thanh cong tham hang cong san hang ca*.