Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham luc » cham soc, nhan luc, cham cuu
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu su » hieu sau, tieu su, hieu so
sach va » sach xa, sach ha, sach dao
tu sach » thu sach, su sach, te sach
hieu vu » hieu va, hieu ve, dieu vu
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach va ((nang xa) or (tang ma)) hoi. ((hieu vu) OR (hieu su)) cham luc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang xa) OR (tang ma)) hoi. ((hieu vu) OR (hieu su)) cham luc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach va ((nang xa) or (tang ma)) hoi. ((hieu vu) OR (hieu su)) cham luc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach va ((nang xa) or (tang ma)) hoi. ((hieu vu) OR (hieu su)) cham luc va hanh di cua viet*.