Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cham luc » cham soc, nhan luc, cham cuu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va hanh, dia danh
te sach » toc sach
7 tang » 6 tang
y tang » ky tang, 6 tang, 5 tang
va dan » ca dan, va dao, va dau
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) or (7 tang)) ma hoa. hieu ve cham luc ((va danh) OR (va dan)) dau su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (7 tang)) ma hoa. hieu ve cham luc ((va danh) OR (va dan)) dau su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (7 tang)) ma hoa. hieu ve cham luc ((va danh) OR (va dan)) dau su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (7 tang)) ma hoa. hieu ve cham luc ((va danh) OR (va dan)) dau su triet*.