Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
hanh than » hanh han, hanh nhan, hanh phan
cua nhung » va nhung
than cua » nhan cua, thai cua, ban cua
cong tan » cong tac, cong san, cong thanh
gian cac » gian dan
gian cua » gian xu, ban cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sach)) - hanh than cua nhung cong tan ((gian cac) OR (gian cua))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sach)) - hanh than cua nhung cong tan ((gian cac) OR (gian cua)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu lang) or (chieu sach)) - hanh than cua nhung cong tan ((gian cac) OR (gian cua))".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sach)) - hanh than cua nhung cong tan ((gian cac) OR (gian cua))*.