Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va chat » van chat, va phat, hoa chat
sach ty » sach y, sach tu, sach thu
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
tuc va » thuc va, truc va, tuc xa
vi dua » vi du, vi lua
vi dum » vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu ((va chat) or (cao chat)) tuc va dinh ((vi dua) OR (vi dum)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((va chat) OR (cao chat)) tuc va dinh ((vi dua) OR (vi dum)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ((va chat) or (cao chat)) tuc va dinh ((vi dua) OR (vi dum)) tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((va chat) or (cao chat)) tuc va dinh ((vi dua) OR (vi dum)) tren*.