Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
luc va » duc va, tuc va, loc va
ve dau » va dau, ve du, ke dau
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 ((nang xa) or (nang x)) hoi. hieu ve cham luc va hanh ve dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky ((nang xa) OR (nang x)) hoi. hieu ve cham luc va hanh ve dau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky ((nang xa) or (nang x)) hoi. hieu ve cham luc va hanh ve dau tren*.