Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
ky tang » ky nang, ky dang, kho tang
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
y tang » 6 tang, 7 tang, 5 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 (ky tang)) ma hoi. hieu van ((cham luc) OR (cham cuu)) va danh dau cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (ky tang)) ma hoi. hieu van ((cham luc) OR (cham cuu)) va danh dau cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) or (ky tang)) ma hoi. hieu van ((cham luc) OR (cham cuu)) va danh dau cua viet".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) or (ky tang)) ma hoi. hieu van ((cham luc) OR (cham cuu)) va danh dau cua viet*.