Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
van chat » cao chat
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky ((nang ma) OR (tang ma)) hoi. hieu van chat xuc ((ban hanh) or (va danh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky ((nang ma) OR (tang ma)) hoi. hieu van chat xuc ((ban hanh) OR (va danh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac ky ((nang ma) OR (tang ma)) hoi. hieu van chat xuc ((ban hanh) or (va danh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su cac ky ((nang ma) OR (tang ma)) hoi. hieu van chat xuc ((ban hanh) or (va danh)) thai cua tre*.