Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
xanh di » danh di, vanh dai, xanh tai
va xanh » va danh, va hanh, va anh
truc va » thuc va, thuc vat, trung va
van bac » van ban, van bao, van hac
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
van ha » van hoa, van chat, van hanh
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky tang) OR (ky dang)) ma hoa. hieu ((van bac) or (van ha)) truc va xanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky dang)) ma hoa. hieu ((van bac) OR (van ha)) truc va xanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) OR (ky dang)) ma hoa. hieu ((van bac) or (van ha)) truc va xanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) OR (ky dang)) ma hoa. hieu ((van bac) or (van ha)) truc va xanh di cua te*.