Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
duc tren » duoc tren, dua tren, duc tien
tu cach » tu cac
te sach » toc sach
nang xa » nang x, lang xa, nang ma
nam duc » nam duoc, pham duc, nam thuc
va lang » va nang, hoa lang
lang di » lang dai, hang di, lang du
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) OR (thien van)) nam duc 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) OR (thien van)) nam duc 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) OR (thien van)) nam duc va lang di duc tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (te sach)) ky nang xa hoi. ((hieu van) OR (thien van)) nam duc va lang di duc tren*.