Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu
cua thong » cua thuong, cua khong, cua tong
cong vang » cong lang, cong quang, cong ngang
vang toan » van toan, dang toan, quang toan
canh van » anh van, can van, cach van
toan cao » toan ban, toan tap
van cua » vang cua, ban cua, dan cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) OR (hoc hien)) sach - canh van cua thong cong vang toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (hoc hien)) sach - canh van cua thong cong vang toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (hoc hien)) sach - canh van cua thong cong vang toan cao*.