Perhaps you should try some spelling variations:
su sach » so sach
tai cua » thai cua, tai cuc, tri cua
dau tai » dai tai, dat tai, da tai
cac tuc » cac toc, cac tu, cac tac
dong ha » dong hoa, dong va, dong hoc
dang ha » dung ha, lang ha, tang ha
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
va dau » va dao

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) OR (vu sach)) ky ((dang ha) or (dong ha)) hoi. lieu va cac tuc va dau tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky ((dang ha) OR (dong ha)) hoi. lieu va cac tuc va dau tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky ((dang ha) or (dong ha)) hoi. lieu va cac tuc va dau tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky ((dang ha) or (dong ha)) hoi. lieu va cac tuc va dau tai cua tre*.