Perhaps you should try some spelling variations:
luoc van » luoc can, luc van, luot van
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
luoc va » nuoc va, duoc va, loc va
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 y ((nang xa) or (nang ma)) hoi. lieu va cham ((luoc van) OR (luoc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang ma)) hoi. lieu va cham ((luoc van) OR (luoc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) or (nang ma)) hoi. lieu va cham ((luoc van) OR (luoc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. lieu va cham ((luoc van) OR (luoc va)) hanh vi cua tre*.