Perhaps you should try some spelling variations:
van chinh » va chinh, lan chinh, van thinh
cua viet » ca viet, hoa viet, cua vat
chinh la » chinh ta, chinh va, chinh ca
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
te sach » toc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
la cua » lai cua, lam cua, lua cua

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