Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
danh dau » lanh dao, hang dau, danh tu
cham luc » cham soc, nhan luc, cham cuu
te sach » toc sach
va danh » va dinh, va dan, va hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
y tang » ky tang, 6 tang, 5 tang
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
7 tang » 6 tang

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 hoi. hieu ve cham luc va danh dau ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (7 tang)) ma hoi. hieu ve cham luc va danh dau ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (7 tang)) ma hoi. hieu ve cham luc va danh dau ((cua viet) OR (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (7 tang)) ma hoi. hieu ve cham luc va danh dau ((cua viet) OR (hoa viet))*.