Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
xanh di » danh di, vanh dai, xanh tai
banh di » danh di, banh chi, vanh dai
cua tre » cua te, cuu tre, cua triet
cau xuc » cam xuc, cau luc, chat xuc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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 ty nang xa hoi. hieu van ((cau xuc) or (cau truc)) ban ((banh di) OR (xanh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu van ((cau xuc) OR (cau truc)) ban ((banh di) OR (xanh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. hieu van ((cau xuc) or (cau truc)) ban ((banh di) OR (xanh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu van ((cau xuc) or (cau truc)) ban ((banh di) OR (xanh di)) cua tre*.