Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sai ky » sac ky
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky dang xa hoi. hieu va pham duc ((van hanh) or (ban hanh)) thai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang xa hoi. hieu va pham duc ((van hanh) OR (ban hanh)) thai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. hieu va pham duc ((van hanh) or (ban hanh)) thai ((cua tre) or (cuu tre))*.