Perhaps you should try some spelling variations:
kham soc » cham soc, kham cuoc, ham so
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
vu kham » vu khanh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu hoach)) ky ((nang xa) OR (nang x)) hoi. hieu vu kham soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky ((nang xa) OR (nang x)) hoi. hieu vu kham soc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu hoach)) ky ((nang xa) OR (nang x)) hoi. hieu vu kham soc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky ((nang xa) OR (nang x)) hoi. hieu vu kham soc va hanh vi cua tre*.