Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van hanh » ban hanh, van anh, van ban
nang xa » nang x, lang xa, nang ma
nam qua » nam quan, nam mua, nam xua
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua

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 ky nang xa hoi. hieu van ((nam qua) OR (nam cua)) ((van hanh) or (van thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van ((nam qua) OR (nam cua)) ((van hanh) OR (van thanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van ((nam qua) OR (nam cua)) ((van hanh) or (van thanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van ((nam qua) OR (nam cua)) ((van hanh) or (van thanh)) di cua tre*.