Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van pham » san pham, van phan, van tham
van phat » va phat, van chat, van phan
cau tren » cu tren, dau tren, ca tren
cua viet » ca viet, hoa viet, cua vat
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
y nang » ky nang, ly nang, v nang
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 y nang x hoi. hieu ((van pham) OR (van phat)) duc va hanh de ((cau tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((van pham) OR (van phat)) duc va hanh de ((cau tren) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ((van pham) OR (van phat)) duc va hanh de ((cau tren) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((van pham) OR (van phat)) duc va hanh de ((cau tren) or (cua viet))*.