Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, hieu ca, biet cach
trung ca » trung cap, truong ca, trung cua
cong san » cong tac
pham cau » phan cau, pham ca, pham can
tung ca » tang ca, cung ca, hung ca

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 cach) OR (chieu sach)) - thanh ((tung ca) or (trung ca)) nhung cong san pham cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (chieu sach)) - thanh ((tung ca) OR (trung ca)) nhung cong san pham cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) OR (chieu sach)) - thanh ((tung ca) or (trung ca)) nhung cong san pham cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) OR (chieu sach)) - thanh ((tung ca) or (trung ca)) nhung cong san pham cau*.