Perhaps you should try some spelling variations:
hoc thieu » hoc hien
hanh tran » hanh trang, thanh tran, thanh trang
hanh tram » hanh tam, hanh trang, thanh tran
dung cong » dung trong
cong sach » ong sach, song sach, duong sach
sach tham » sach nha
van dung » van dong, xay dung, tin dung
tham cao » thai cao, tham khao, thuat cao

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

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