Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dai moi » doi moi
dai hoi » dai hoc, dai hai
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
cua te » cua tu

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

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