Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
phung cong » nhung cong, phong cong, nhung chong
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh phan » thanh phan, anh phan, hanh nhan
hanh han » hanh nhan, hanh san, anh han
va phung » va phuong, van phung, va nhung
cong dan » cong san, cong tan, huong dan
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha 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 - ((hanh han) OR (hanh phan)) va phung cong dan ((than tap) or (phan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - ((hanh han) OR (hanh phan)) va phung cong dan ((than tap) OR (phan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - ((hanh han) OR (hanh phan)) va phung cong dan ((than tap) or (phan tap))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - ((hanh han) OR (hanh phan)) va phung cong dan ((than tap) or (phan tap))*.