Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
va hanh » va thanh, va danh, ban hanh
tai cua » thai cua, tai cuc, tri cua
cam luc » cam xuc, cau luc
lang ha » long ha
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
sai ky » sac ky
va cam » va cham, va cac, va cao
ha hoi » hoa hoi, ha noi, xa hoi
te sai » te tai, te bai, te lai

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

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