Perhaps you should try some spelling variations:
luoc van » luoc can, luc van, luot van
cua tre » cua te, cuu tre, cua triet
luoc va » nuoc va, duoc va, loc va
ky dang » ky nang
ky danh » ky anh
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
te sac » te sach, te cac, te san
ve cam » ve cham, ve cac, va cam

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

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