Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang tai » hang tai, tang tai, sang tai
hanh dai » hanh tai, hanh dao, vanh dai
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
tai roi » lai roi, tai hoi, tai loi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
ve cam » ve cham, va cam, ve cai

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 y nang tai roi. hieu ((ve cam) or (ve cac)) luc va hanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang tai roi. hieu ((ve cam) OR (ve cac)) luc va hanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang tai roi. hieu ((ve cam) or (ve cac)) luc va hanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang tai roi. hieu ((ve cam) or (ve cac)) luc va hanh dai ((cua tre) OR (cua triet))*.