Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
hoang hai » hoang thi, hoang van
toc sach » hoc sach, doc sach, thuoc sach
khang xa » khang a, hang ca, lang xa
hang lai » hang tai, hang hai, hang loi
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thieu khang xa hoi. hieu va cac duc ban ((hang lai) or (hoang hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thieu khang xa hoi. hieu va cac duc ban ((hang lai) OR (hoang hai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach thieu khang xa hoi. hieu va cac duc ban ((hang lai) or (hoang hai)) cua tre*.