Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
danh giao » doanh giao, danh gia, anh giao
doc sach » hoc sach, toc sach, dac sac
hieu van » hieu va, thien van, lieu va
giao su » giao duc
va danh » va dinh, va dan, va hanh
cac xuc » cac nuoc, chat xuc, cac cuoc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su tien » su kien, su hien, tu tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (nuoc sach)) ty nang xa hoi. hieu van ((cac xuc) OR (cam xuc)) va danh giao su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (nuoc sach)) ty nang xa hoi. hieu van ((cac xuc) OR (cam xuc)) va danh giao su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (nuoc sach)) ty nang xa hoi. hieu van ((cac xuc) OR (cam xuc)) va danh giao su tien".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) or (nuoc sach)) ty nang xa hoi. hieu van ((cac xuc) OR (cam xuc)) va danh giao su tien*.