Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, nam thu, nam tu
van dung » van dong, xay dung, tin dung
dung cam » dung lam, dung cac, dung nam
ky dang » ky nang
ky danh » ky anh
ca phoi » cap phoi, cay phoi, gap phoi
cam cua » ca cua, nam cua, cau cua
cua tre » cua te, cuu tre, cua triet
so sai » so dai, so hai, do sai

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sai ((ky dang) OR (ky danh)) ca phoi. hieu van ((nam thuc) or (am thuc)) van dung cam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sai ((ky dang) OR (ky danh)) ca phoi. hieu van ((nam thuc) OR (am thuc)) van dung cam cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sai ((ky dang) OR (ky danh)) ca phoi. hieu van ((nam thuc) or (am thuc)) van dung cam cua tre*".