Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
cua triet » cua viet, su triet, va triet
khang xa » khang a, hang ca, lang xa
tam thuc » tham thuc, am thuc, dam thuc
nam thuc » nam thuoc, am thuc, nam thu
dan hanh » dang hanh, dan khanh, dan thanh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua

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