Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thu hoach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
coc duc » coc luc, hoc duoc, ngoc duc
hoc duc » hoc duoc, hoc nuoc, hoc thuc
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuoc sach)) ky nang xa hoi. hieu va ((coc duc) OR (hoc duc)) van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang xa hoi. hieu va ((coc duc) OR (hoc duc)) van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) ky nang xa hoi. hieu va ((coc duc) OR (hoc duc)) van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) ky nang xa hoi. hieu va ((coc duc) OR (hoc duc)) van hanh vi cua triet*.