Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
cong quang » luong quang, thong quang, duong quang
quang toan » quang tuan, quang tran, quang doan
hoc thieu » toc thieu, hoc hien
ho chieu » theo chieu, doi chieu, mot chieu
toan cao » toan ban, toan tap
manh va » hanh va, anh va, lanh va
minh va » tinh va, sinh va, sinh 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 (hoc thieu)) sach - canh ((manh va) OR (minh va)) nhung cong quang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - canh ((manh va) OR (minh va)) nhung cong quang toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (hoc thieu)) sach - canh ((manh va) OR (minh va)) nhung cong quang toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) sach - canh ((manh va) OR (minh va)) nhung cong quang toan cao*.