Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
tai cua » thai cua, tai cuc, tri cua
cao luc » bao luc, cao suc, cau luc
lang ha » long ha
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
hoc cac » hoc cao
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sinh) or (hoc cac)) ky lang ha hoi. hieu va ((cao luc) OR (cao duc)) van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sinh) OR (hoc cac)) ky lang ha hoi. hieu va ((cao luc) OR (cao duc)) van hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sinh) or (hoc cac)) ky lang ha hoi. hieu va ((cao luc) OR (cao duc)) van hanh tai cua tre*".