Perhaps you should try some spelling variations:
nhan luc » nang luc
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
cuc tre » cua tre, cuu tre, cuc thue
va hanh » va thanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
ve nhan » ve nha, de nhan, va nhan
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mam, dang mat
ky dang » ky nang, ky danh
duc tre » duoc tren, duc tien
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 dang ma hoi. hieu ve nhan luc ((va hanh) OR (van hanh)) tai ((cuc tre) or (duc tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang ma hoi. hieu ve nhan luc ((va hanh) OR (van hanh)) tai ((cuc tre) OR (duc tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang ma hoi. hieu ve nhan luc ((va hanh) OR (van hanh)) tai ((cuc tre) or (duc tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang ma hoi. hieu ve nhan luc ((va hanh) OR (van hanh)) tai ((cuc tre) or (duc tre))*.