Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
sai ky » sac ky
ve cam » ve cham, ve cac, va cam
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 xa) or (dang ha)) hoi. hieu ve cam duc ((van hanh) OR (ban hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang xa) OR (dang ha)) hoi. hieu ve cam duc ((van hanh) OR (ban hanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang xa) or (dang ha)) hoi. hieu ve cam duc ((van hanh) OR (ban hanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((dang xa) or (dang ha)) hoi. hieu ve cam duc ((van hanh) OR (ban hanh)) thai cua tre*.