Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phat xuc » chat xuc, phat xuat, phap xu
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
doi cua » dai cua, hoi cua
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 cach) or (thu sach)) ky nang xa hoi. hieu va phat xuc ((va hanh) OR (van hanh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang xa hoi. hieu va phat xuc ((va hanh) OR (van hanh)) doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang xa hoi. hieu va phat xuc ((va hanh) OR (van hanh)) doi cua tre*".