Perhaps you should try some spelling variations:
thien van » thi van
nam tuc » nam thuc, nam truc, nam thuoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
nam tu » nam thu, nam thuc
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 san)) ky nang x ho. thien van ((nam tuc) or (nam tu)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang x ho. thien van ((nam tuc) OR (nam tu)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu san)) ky nang x ho. thien van ((nam tuc) or (nam tu)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu san)) ky nang x ho. thien van ((nam tuc) or (nam tu)) va hanh vi cua tre*.