Perhaps you should try some spelling variations:
nhung hoang » khung hoang, phuong hoang, nhung cong
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
hoang van » hang va
sinh va » sinh vat, tinh va, dinh van
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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 ((sinh va) or (tinh chat)) nhung hoang van tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh ((sinh va) OR (tinh chat)) nhung hoang van tan cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - hanh ((sinh va) or (tinh chat)) nhung hoang van tan cau*.