Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hieu cua » hieu qua, dieu cua, bieu cua
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, dua tren, cua thep
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang xa hoi. hieu cua cac luc van hanh di ((((cua tre) OR (cua triet))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu cua cac luc van hanh di ((((cua tre) OR (cua triet))) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu cua cac luc van hanh di ((((cua tre) OR (cua triet))) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu cua cac luc van hanh di ((((cua tre) OR (cua triet))) or (cuu tre))*.