Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
hai ky » thai ky, hoi ky, sai ky
ve cam » ve cham, ve cac, va cam
hai ly » dai ly

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

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