Perhaps you should try some spelling variations:
hien sach » dien sach, thien hach, chieu sach
kien sach » dien sach, vien bach, kien mac
hanh tran » hanh trang, thanh tran, hanh tram
hung cong » nhung cong, hung cuong, phung cong
tran van » luan van
van hung » van dung, manh hung, van duong
cong von » dong von, cong lon, cong hon
tai cao » thai cao, tao cao, tai sao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (kien sach)) - hanh tran van hung cong von tai cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (kien sach)) - hanh tran van hung cong von tai cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (kien sach)) - hanh tran van hung cong von tai cao*.