Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac loc » cac lop, cac toc, cac hoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu san, tu bac, tu lac
loc va » hoc va, luc 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: ((((tu sac) OR (tu sach))) or (tu cac)) ky nang xa hoi. hieu van cac loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sac) OR (tu sach))) OR (tu cac)) ky nang xa hoi. hieu van cac loc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sac) OR (tu sach))) or (tu cac)) ky nang xa hoi. hieu van cac loc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((tu sac) OR (tu sach))) or (tu cac)) ky nang xa hoi. hieu van cac loc va hanh vi cua tre*.