Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham luc » cham soc, nhan luc, cham cuu
su sach » so sach, vu sach
va cham » va chat, va tham
hanh di » hanh vi, hang di, danh di
hanh de » hanh ve, hanh kem
tu sach » thu sach, te sach, tu cach
v nang » va nang, vu nang, van nang
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho

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) or (su sach)) v nang x hoi. lieu va cham luc va ((hanh di) OR (hanh de)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) v nang x hoi. lieu va cham luc va ((hanh di) OR (hanh de)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) v nang x hoi. lieu va cham luc va ((hanh di) OR (hanh de)) cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) v nang x hoi. lieu va cham luc va ((hanh di) OR (hanh de)) cau tren*.