Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
anh via » anh va, anh bia, anh viet
via cua » gia cua, gian cua, giau cua
lo van » vo van, so van, do van
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: thu sach ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((lo van) OR (le van)) anh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cac ((lo van) OR (le van)) anh via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((lo van) OR (le van)) anh via cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((lo van) OR (le van)) anh via cua te*.