Perhaps you should try some spelling variations:
cuc triet » cua triet, su triet, cac trieu
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hanh xa » hanh va, hanh ma, hanh xu
ve nam » he nam, le nam, te nam
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hanh xa hoi. hieu ((ve nam) or (va nam)) thuc dan hanh tai cuc triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. hieu ((ve nam) OR (va nam)) thuc dan hanh tai cuc triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. hieu ((ve nam) or (va nam)) thuc dan hanh tai cuc triet*.