Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
thuc ban » thuoc ban, thu ban, thuc van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (thu sach)) ky nang ma hoi. lieu va cam ((thuc ban) or (thuc dan)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (thu sach)) ky nang ma hoi. lieu va cam ((thuc ban) OR (thuc dan)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (thu sach)) ky nang ma hoi. lieu va cam ((thuc ban) or (thuc dan)) hanh vi cua tre*.