Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren, cau treo
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
lang xa » dang xay, lang van
lang ha » long ha
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((lang xa) or (lang ha)) hoi. hieu va cam xuc van hanh dai ((cuu tre) or (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (lang ha)) hoi. hieu va cam xuc van hanh dai ((cuu tre) OR (cau theo)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang xa) or (lang ha)) hoi. hieu va cam xuc van hanh dai ((cuu tre) or (cau theo))*.