Perhaps you should try some spelling variations:
hau triet » cau triet, hanh triet, hieu triet
lanh hai » manh hai, thanh hai, lang chai
danh hai » dang hai, manh hai, danh hau
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
xuc va » duc va, tuc va, luc va
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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 ((o hoi) OR (o hoc)). hieu qua cac xuc va ((danh hai) or (lanh hai)) hau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (o hoc)). hieu qua cac xuc va ((danh hai) OR (lanh hai)) hau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((o hoi) OR (o hoc)). hieu qua cac xuc va ((danh hai) or (lanh hai)) hau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) OR (o hoc)). hieu qua cac xuc va ((danh hai) or (lanh hai)) hau triet*.