Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua, dong cua
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
xuc va » duc va, luc va, xac va
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh ((vi cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh ((vi cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh ((vi cua) or (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu va cam ((xuc va) OR (tuc va)) thanh ((vi cua) or (doi cua)) tre*.