Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
chat loc » chat hoc, chat doc, chat long
cap phoi » cap cho
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va chat » van chat, va phat, cao chat
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang ((xay hoi) or (cap phoi)). hieu va chat loc va thanh vi ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ((xay hoi) OR (cap phoi)). hieu va chat loc va thanh vi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ((xay hoi) or (cap phoi)). hieu va chat loc va thanh vi ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ((xay hoi) or (cap phoi)). hieu va chat loc va thanh vi ((cuu tre) OR (cau tren))*.