Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hanh thai » nhanh thai, hanh tai, anh thai
thu san » thuy san, thu ban, phu san
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
tu bat » tu ban, tu dat
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
cua te » cua tu
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 bat) or (thu san)) ky nang o lai. hieu ve cac duc van ((hanh thai) OR (hinh thai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bat) OR (thu san)) ky nang o lai. hieu ve cac duc van ((hanh thai) OR (hinh thai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bat) or (thu san)) ky nang o lai. hieu ve cac duc van ((hanh thai) OR (hinh thai)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu bat) or (thu san)) ky nang o lai. hieu ve cac duc van ((hanh thai) OR (hinh thai)) cua te*.