Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cua cau » cua cac, cua cay, cua can
hanh di » hanh vi, hanh de, hang di
xuc van » duc van, luc van, vuc van
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
cua chu » sua chua

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

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