Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
tinh va » tich va, trinh van, trinh vat
luc may » truc may, phuc may
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
sang ma » sang tao, mang may, sang tai
nang ma » nang cao, mang may
va cua » va chua, via cua, ca 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 ky ((nang ma) or (((sang ma) OR (tang ma)))) hoi. hieu ve cham luc may tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (((sang ma) OR (tang ma)))) hoi. hieu ve cham luc may tinh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (((sang ma) OR (tang ma)))) hoi. hieu ve cham luc may tinh va cua tre*".