Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cham luc » cham soc, nhan luc, cham cuu
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
te sach » toc sach
tang ma » mang may, tang van
hieu ve » hieu van
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa
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 y tang ma hoi. ((hieu ve) or (hieu va)) cham luc ((va danh) OR (va hanh)) dau su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang ma hoi. ((hieu ve) OR (hieu va)) cham luc ((va danh) OR (va hanh)) dau su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y tang ma hoi. ((hieu ve) or (hieu va)) cham luc ((va danh) OR (va hanh)) dau su triet".
• Adding a wildcard symbol may retrieve word variants: te sach y tang ma hoi. ((hieu ve) or (hieu va)) cham luc ((va danh) OR (va hanh)) dau su triet*.