Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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 ky nang xa hoi. hieu va cac ((luc va) or (tuc va)) hanh ((di cua) OR (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va cac ((luc va) OR (tuc va)) hanh ((di cua) OR (de cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu va cac ((luc va) or (tuc va)) hanh ((di cua) OR (de cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va cac ((luc va) or (tuc va)) hanh ((di cua) OR (de cua)) te*.