Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
van hac » van hoc, van ha, van hai
ma hoi » mai hoi, xa hoi, ma hoa
va hac » va khac, va cac, va hoc
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: ((thu sach) or (tu sach)) ky nang ma hoi. lieu ((va hac) OR (van hac)) dat va thanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang ma hoi. lieu ((va hac) OR (van hac)) dat va thanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky nang ma hoi. lieu ((va hac) OR (van hac)) dat va thanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang ma hoi. lieu ((va hac) OR (van hac)) dat va thanh vi cua vat*.