Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuc tre » duc tre, cua tre, cuc thue
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi. hieu ve cham luc ((va tinh) OR (may tinh)) tai ((cuc tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ve cham luc ((va tinh) OR (may tinh)) tai ((cuc tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu ve cham luc ((va tinh) OR (may tinh)) tai ((cuc tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ve cham luc ((va tinh) OR (may tinh)) tai ((cuc tre) or (cuu tre))*.