Perhaps you should try some spelling variations:
te sach » toc sach
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
doan vi » doan va, don vi, doan thi
luy tre » luyen tre
hieu ve » hieu va, hieu van
ly nang » ky nang, ly hang, ly vang
luc va » duc va, tuc va
ve cac » va cac, vien cac
loc va » hoc va
x hoi » xa hoi, o hoi, x ho

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 ly nang x hoi. hieu ve cac ((luc va) OR (loc va)) doan vi ((cua tre) or (luy tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang x hoi. hieu ve cac ((luc va) OR (loc va)) doan vi ((cua tre) OR (luy tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang x hoi. hieu ve cac ((luc va) OR (loc va)) doan vi ((cua tre) or (luy tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang x hoi. hieu ve cac ((luc va) OR (loc va)) doan vi ((cua tre) or (luy tre))*.