Perhaps you should try some spelling variations:
hanh vinh » thanh vinh, khanh vinh, hanh tinh
hieu van » hieu va, thien van, lieu va
vinh cuu » dinh cuu, sinh cua, dinh cu
cuu tre » cua tre, cau tren, cau treo
van hai » van ha, van chat, van hanh
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh
ky dang » ky nang
xuc va » duc va, tuc va, luc va
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ((ky dang) OR (ky danh)) xay hoi. hieu van hai ((xuc va) or (thuc vat)) hanh vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky dang) OR (ky danh)) xay hoi. hieu van hai ((xuc va) OR (thuc vat)) hanh vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky dang) OR (ky danh)) xay hoi. hieu van hai ((xuc va) or (thuc vat)) hanh vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky dang) OR (ky danh)) xay hoi. hieu van hai ((xuc va) or (thuc vat)) hanh vinh cuu tre*.