Perhaps you should try some spelling variations:
sach kem » hanh kem
cham luc » cham soc, nhan luc, cham cuu
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
vi su » va su, ve su, ki su

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 kem) or (sach y)) ((nang xa) or (nang x)) hoi. hieu va cham luc va hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kem) OR (sach y)) ((nang xa) OR (nang x)) hoi. hieu va cham luc va hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: su ((sach kem) or (sach y)) ((nang xa) or (nang x)) hoi. hieu va cham luc va hanh vi su tien*.