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