Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
cham duc » pham duc, cham soc, phan duc
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
pham duy » pham duc
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
dai ky » dan ky, dai ly
sai ky » sac ky

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

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