Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
cuu va » cuu van, cuu ve
vi cua » vai cua, di cua
cu va » tu va, su va, vu va

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