Perhaps you should try some spelling variations:
nang cau » nang cao, hang cau, nang dau
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham loc » cham soc, chon loc, cham o
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, vu dinh
va tinh » may tinh
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 ky nang cau hoi. hieu van cham loc ((va dinh) or (va tinh)) dau su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cau hoi. hieu van cham loc ((va dinh) OR (va tinh)) dau su triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cau hoi. hieu van cham loc ((va dinh) or (va tinh)) dau su triet*.