Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
giau cua » gian cua, gia cua, dieu cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
via cua » gia cua, gian cua, rija cua
ve cac » va cac, vien cac
bo van » vo van, so van, ho van
do van » dao van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu ve cac ((bo van) OR (do van)) anh ((via cua) or (giau cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ve cac ((bo van) OR (do van)) anh ((via cua) OR (giau cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ve cac ((bo van) OR (do van)) anh ((via cua) or (giau cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ve cac ((bo van) OR (do van)) anh ((via cua) or (giau cua)) te*.