Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
hieu quang » thieu quang, hieu quan, hieu qua
tham thuc » nham thuc, pham thuc, tam thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh tai » thanh tai, hang tai, han tai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
tai va » thai va, mai va, tri va

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

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