Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh lam » trinh lam, dinh lam, tinh lao
lam cua » nam cua, lam chat
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, va cam, ve cai
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: vu sach ky nang ((o hoi) or (o hoc)). hieu ((ve cam) OR (ve cac)) tuc va tinh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ((o hoi) OR (o hoc)). hieu ((ve cam) OR (ve cac)) tuc va tinh lam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang ((o hoi) or (o hoc)). hieu ((ve cam) OR (ve cac)) tuc va tinh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ((o hoi) or (o hoc)). hieu ((ve cam) OR (ve cac)) tuc va tinh lam cua triet*.