Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
thu sach » tu sach, thuat sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
va hinh » va chinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cac) or (thu sach)) ky lang xa hoi. hieu ((van cac) OR (van bac)) duc va hinh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (thu sach)) ky lang xa hoi. hieu ((van cac) OR (van bac)) duc va hinh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (thu sach)) ky lang xa hoi. hieu ((van cac) OR (van bac)) duc va hinh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (thu sach)) ky lang xa hoi. hieu ((van cac) OR (van bac)) duc va hinh thai cua tre*.