Perhaps you should try some spelling variations:
thieu hanh » thien thanh, thien chanh, thieu khang
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hanh xu » hanh tu, hanh sua, hanh cua
tai cua » thai cua, tai cuc, tri cua
xu hoi » xa hoi, lu hoi, vu hoi
ve nam » he nam, le nam, te nam
va nam » van nam, ha nam
va nay » va ngay, va cay

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 thieu hanh xu hoi. hieu ((ve nam) or (((va nam) or (va nay)))) thuc day hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu hanh xu hoi. hieu ((ve nam) OR (((va nam) OR (va nay)))) thuc day hanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach thieu hanh xu hoi. hieu ((ve nam) or (((va nam) or (va nay)))) thuc day hanh tai cua triet*.