Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua dieu
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu van pham duc va hanh di ((cau tren) OR (((cua viet) OR (cua vat))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu van pham duc va hanh di ((cau tren) OR (((cua viet) OR (cua vat))))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu van pham duc va hanh di ((cau tren) OR (((cua viet) OR (cua vat))))*.