Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hanh hanh » hanh han, xanh hanh, nhanh thanh
nang cong » nang song, bang cong, hang cong
dang cong » dung cong
toan cao » toan ban, toan tap
hanh va » hang va, hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - hanh hanh va ((nang cong) or (dang cong)) manh ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh hanh va ((nang cong) OR (dang cong)) manh ((toan cao) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh hanh va ((nang cong) or (dang cong)) manh ((toan cao) or (van ban))*.