Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
cham luc » cham soc, nhan luc, cham cuu
sach han » sach tham, sach danh, sach nang
hieu ve » hieu va, hieu van
te sach » toc sach
hieu vu » hieu va, hieu su, dieu vu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di 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 han ((nang xa) or (lang xa)) hoi. ((hieu vu) or (hieu ve)) cham luc va dan vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach han ((nang xa) OR (lang xa)) hoi. ((hieu vu) OR (hieu ve)) cham luc va dan vi cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach han ((nang xa) or (lang xa)) hoi. ((hieu vu) or (hieu ve)) cham luc va dan vi cua viet*.