Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, nam duoc
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, tang ha
lang ha » long ha
sai ky » sac ky
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((dang ha) OR (lang ha)) hoi. hieu ve ((cam duc) or (pham duc)) van thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang ha) OR (lang ha)) hoi. hieu ve ((cam duc) OR (pham duc)) van thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang ha) OR (lang ha)) hoi. hieu ve ((cam duc) or (pham duc)) van thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((dang ha) OR (lang ha)) hoi. hieu ve ((cam duc) or (pham duc)) van thanh thai cua tre*.