Perhaps you should try some spelling variations:
hanh dau » hang dau, danh dau, han dau
su triet » su viet, su tien, ve triet
mai khoi » mai khoa, tai khoa, cac khoi
nang mai » nang ma, nang tai, lang mai
va khai » van khai, va kha, va khi
sach ky » sac ky, sach y, sach ty
luoc va » nuoc va, loc va, luc va
duoc va » nuoc va, duc va, duoc ma
te sach » toc sach
dau su » dau tu, dan su, da su

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 mai khoi. hieu ((va khai) or (va khao)) ((luoc va) OR (duoc va)) hanh dau su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai khoi. hieu ((va khai) OR (va khao)) ((luoc va) OR (duoc va)) hanh dau su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang mai khoi. hieu ((va khai) or (va khao)) ((luoc va) OR (duoc va)) hanh dau su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai khoi. hieu ((va khai) or (va khao)) ((luoc va) OR (duoc va)) hanh dau su triet*.