Perhaps you should try some spelling variations:
duc tren » duoc tren, dua tren, duc tien
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
lang di » lang dai, hang di, lang du
va lang » va nang, hoa lang
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
te sach » toc sach
nam duc » pham duc, nam thuc, nam buoc
di duc » do duc, di du, 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 cach) or (te sach)) ky nang xa hoi. hieu van ((nam duc) OR (nam duoc)) va lang di duc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky nang xa hoi. hieu van ((nam duc) OR (nam duoc)) va lang di duc tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (te sach)) ky nang xa hoi. hieu van ((nam duc) OR (nam duoc)) va lang di duc tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky nang xa hoi. hieu van ((nam duc) OR (nam duoc)) va lang di duc tren*.