Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
theo sach » thuoc sach, te sach, theo lich
hanh hang » thanh hang, hang hang, hanh han
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 ((((theo sach) or (chieu sach))) or (thien hach)) - hanh hang va nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((theo sach) OR (chieu sach))) OR (thien hach)) - hanh hang va nhung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((((theo sach) or (chieu sach))) or (thien hach)) - hanh hang va nhung cong van toan cao*.