Perhaps you should try some spelling variations:
thanh nung » thanh tung, thanh hung, thanh dung
doi chieu » doc hieu, ho chieu, mot chieu
dung cong » dung trong
nung cao » nang cao, nhung cau, quang cao
cao dung » cao dang, cao dong, cao ung
cong tan » cong tac, cong san, cong thanh
phan cau » phan dau, phan cac, phan tu
khan cap » khan ap, than cap, khoan cam
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) OR (doi chi)) sach - thanh nung cao dung cong tan ((phan cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - thanh nung cao dung cong tan ((phan cau) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) sach - thanh nung cao dung cong tan ((phan cau) or (khan cap))".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) sach - thanh nung cao dung cong tan ((phan cau) or (khan cap))*.