Perhaps you should try some spelling variations:
te sach » toc sach
lua tre » cua tre, dua tren, luat tri
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
luy tre » luyen tre
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
ve cam » ve cham, ve cac, va cam
x hoi » o hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((x hoi) OR (xa hoi)). hieu ve cam xuc va dan vi ((lua tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((x hoi) OR (xa hoi)). hieu ve cam xuc va dan vi ((lua tre) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((x hoi) OR (xa hoi)). hieu ve cam xuc va dan vi ((lua tre) or (luy tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((x hoi) OR (xa hoi)). hieu ve cam xuc va dan vi ((lua tre) or (luy tre))*.