Perhaps you should try some spelling variations:
tthanh trung » thanh tung, thanh trang, hanh trang
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hoc thieu » hoc hien
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 (toc thieu)) sach - ((tthanh trung) or (thanh trung)) va nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sach - ((tthanh trung) OR (thanh trung)) va nhung cong van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) sach - ((tthanh trung) or (thanh trung)) va nhung cong van toan cao".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) sach - ((tthanh trung) or (thanh trung)) va nhung cong van toan cao*.