Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cam truc » cau truc, nam truc, lam truoc
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang ma)) hoi. hieu van cam truc ((van hanh) OR (ban hanh)) lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. hieu van cam truc ((van hanh) OR (ban hanh)) lai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (nang ma)) hoi. hieu van cam truc ((van hanh) OR (ban hanh)) lai cua viet*".