Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ban hanh » ban hang
te sach » toc sach
nang ha » nang hai, nang han, nang hoa
cac luc » cau luc, coc luc, cac cuoc
sach ky » sac ky, sach y, sach ty
hanh tu » anh tu, danh tu
ha hoi » hoa hoi, ha noi, xa hoi
thiet » thieu

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