Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thieu sach » chieu sach, hieu cach, thieu cac
cong huong » cong thuong, cong luong, cong hung
theo sach » thuoc sach, te sach, theo lich
hanh tran » hanh trang, thanh tran, hanh tram
tran van » luan van
van cong » van dong, van phong, phan cong
dan toan » van toan, dan than, manh toan
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 sach) OR (theo sach))) or (thien hach)) - hanh tran van cong huong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thieu sach) OR (theo sach))) OR (thien hach)) - hanh tran van cong huong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thieu sach) OR (theo sach))) or (thien hach)) - hanh tran van cong huong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thieu sach) OR (theo sach))) or (thien hach)) - hanh tran van cong huong dan toan cao*.