Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
giao cua » gian cua, gia cua, giau cua
anh giao » nang giao, minh giao, danh gia
hieu van » hieu va, thien van, lieu va
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
lo van » le van, vo van, do van
so van » su van, vo 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) OR (tu sach)) ky nang xa hoi. hieu van cac ((lo van) or (so van)) anh giao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu van cac ((lo van) OR (so van)) anh giao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang xa hoi. hieu van cac ((lo van) or (so van)) anh giao cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu van cac ((lo van) or (so van)) anh giao cua tre*.