Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nhan luc » nang luc
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ve nhan » ve nha, de nhan, va nhan
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
tu sac » tu cac, tu san, tu bac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu sach)) ky ((tang ma) or (nang x)) hoi. hieu ve nhan luc va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky ((tang ma) OR (nang x)) hoi. hieu ve nhan luc va hanh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky ((tang ma) or (nang x)) hoi. hieu ve nhan luc va hanh ve cau tren*.