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

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 (van anh)) thai ((dua tren) or (cua te))~.
• 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 (van anh)) thai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang xa hoi. hieu va pham duc ((van hanh) OR (van anh)) thai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang xa hoi. hieu va pham duc ((van hanh) OR (van anh)) thai ((dua tren) or (cua te))*.