Perhaps you should try some spelling variations:
hoang thai » hoang hai, hong thai, hoang thanh
dang xay » dang van, van xay
su sach » so sach, vu sach
soc ban » hoc ban, coc ban, so ban
hieu va » lieu va, hieu qua
va cham » va chat, va tham
lang xa » lang ha, lang van
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: su sach _ ((lang xa) OR (dang xay)) hoi. hieu va cham soc ban ((hoang thai) or (hoang thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ ((lang xa) OR (dang xay)) hoi. hieu va cham soc ban ((hoang thai) OR (hoang thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ ((lang xa) OR (dang xay)) hoi. hieu va cham soc ban ((hoang thai) or (hoang thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach _ ((lang xa) OR (dang xay)) hoi. hieu va cham soc ban ((hoang thai) or (hoang thi)) cua tre*.