Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
thanh vi » hanh vi, thanh va, nhanh vi
thanh ve » hanh ve, thanh va, thanh vien
nang ma » tang ma, sang ma, nang cao
cac dat » cac dan, cai dat, cac dai
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) ky nang ma hoi. lieu va cac dat va ((thanh vi) or (thanh ve)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang ma hoi. lieu va cac dat va ((thanh vi) OR (thanh ve)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang ma hoi. lieu va cac dat va ((thanh vi) or (thanh ve)) cua vat".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang ma hoi. lieu va cac dat va ((thanh vi) or (thanh ve)) cua vat*.