Perhaps you should try some spelling variations:
hoang tinh » hoang thinh, hoang minh, hoang dinh
doi chieu » doc hieu, doi chi, mot chieu
cong vang » cong lang, cong quang, cong ngang
ho chieu » theo chieu, hoc thieu, mot chieu
cong san » cong tac
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) OR (doi chieu)) sach - hoang tinh va nhung ((cong vang) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hoang tinh va nhung ((cong vang) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (doi chieu)) sach - hoang tinh va nhung ((cong vang) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (doi chieu)) sach - hoang tinh va nhung ((cong vang) or (cong san)) toan cao*.