Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
te sach » toc sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc
hanh ha » nhanh ha, thanh ha, hanh hoa
ha cua » hoa cua, hai cua, nha cua

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 ((ky lang) OR (ky nang)) xa hoi. hieu va ((cac duc) or (cac du)) ban hanh ha cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky nang)) xa hoi. hieu va ((cac duc) OR (cac du)) ban hanh ha cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky nang)) xa hoi. hieu va ((cac duc) or (cac du)) ban hanh ha cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky nang)) xa hoi. hieu va ((cac duc) or (cac du)) ban hanh ha cua triet*.