Perhaps you should try some spelling variations:
thu canh » thuc hanh, thu cong, thu ban
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cac loc » cac lop, cac toc, cac hoc
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
tu can » tu ban, tu cac
loc va » hoc va, luc va
vi cua » vai cua, di cua
tu san » thu san, tu ban, vu san

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

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