Perhaps you should try some spelling variations:
te sach » toc sach
cam luc » cam xuc, cau luc
cua tre » cuu tre, cua triet, dua tren
han tai » hang tai, nhan tai, van tai
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
va han » va phan, van han, va hanh
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
tu san » thu san, tu ban, tu can
cua te » cua tu

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) or (tu san)) ky dang xa hoi. hieu va cam luc va han tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (tu san)) ky dang xa hoi. hieu va cam luc va han tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (tu san)) ky dang xa hoi. hieu va cam luc va han tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (tu san)) ky dang xa hoi. hieu va cam luc va han tai ((cua tre) OR (cua te))*.