Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
dau tren » dau tien, dat tren, dau tieng
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi dau » vi dai, va dau, bi dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang xa hoi. hieu van cac nuoc va dan vi dau tren~.
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang xa hoi. hieu van cac nuoc va dan vi dau tren*.