Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
nam truc » nam truoc, nam thuc, nam trung
vai cua » dai cua, hai cua, lai cua
nam tuc » nam thuc, nam tu, nam thuoc
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cach tu » cach thuc
cua cu » cua chu, cua cau, cua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (cach tu)) xang xa hoi. hieu van ((nam tuc) OR (nam truc)) van hanh vai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (cach tu)) xang xa hoi. hieu van ((nam tuc) OR (nam truc)) van hanh vai cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (cach tu)) xang xa hoi. hieu van ((nam tuc) OR (nam truc)) van hanh vai cua cu".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (cach tu)) xang xa hoi. hieu van ((nam tuc) OR (nam truc)) van hanh vai cua cu*.