Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
thu san » thuy san, thu ban, phu san
duc van » duc va, duc tan, duc manh
hieu ve » hieu van
cac duc » cac du, cao duc, cac dac
tu sac » tu sach, tu cac, tu san
nang o » nang co, nang ho, nang ro
o lai » o lao

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 (thu san)) ky nang o lai. ((hieu ve) OR (hieu va)) cac duc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu san)) ky nang o lai. ((hieu ve) OR (hieu va)) cac duc van hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (thu san)) ky nang o lai. ((hieu ve) OR (hieu va)) cac duc van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu san)) ky nang o lai. ((hieu ve) OR (hieu va)) cac duc van hanh thai cua tre*.