Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
nang mai » nang ma, nang tai, lang mai
hieu va » lieu va, hieu qua
van anh » van thanh, tuan anh, van minh
luc van » luoc van, luu van, duc van
su viet » so viet
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
anh vi » hanh vi, anh va, anh ve
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang mai hoi. ((hieu ve) OR (hieu va)) cham luc van anh vi su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang mai hoi. ((hieu ve) OR (hieu va)) cham luc van anh vi su viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang mai hoi. ((hieu ve) OR (hieu va)) cham luc van anh vi su viet*.