Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hang tai » hang va, dung tai
cuu tre » cua tre, cau tren, cau treo
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
thu san » thuy san, thu ban, phu san
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
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 va cac duc van ((hang tai) or (hinh thai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu san)) ky nang o lai. hieu va cac duc van ((hang tai) OR (hinh thai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu san)) ky nang o lai. hieu va cac duc van ((hang tai) or (hinh thai)) cuu tre*.