Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va danh, ban hanh
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. hieu van pham duc ((va hanh) OR (va thanh)) de ((cau treo) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu van pham duc ((va hanh) OR (va thanh)) de ((cau treo) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu van pham duc ((va hanh) OR (va thanh)) de ((cau treo) or (ca viet))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu van pham duc ((va hanh) OR (va thanh)) de ((cau treo) or (ca viet))*.