Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hang » van khang, van hoang, van thang
hang doi » hang di, hang loi, huong doi
duc tren » duoc tren, dua tren, duc tien
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
nam duc » nam duoc, pham duc, nam thuc
duc van » duc va, duc tan, duc manh
doi duc » do duc, doi duy, oi duc

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 ((ky lang) or (ky tang)) xa hoi. hieu van nam duc van hang doi duc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu van nam duc van hang doi duc tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky tang)) xa hoi. hieu van nam duc van hang doi duc tren*.