Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
cham luc » cham soc, nhan luc, cham cuu
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
tu sach » te sach, tu cach, vu sach
vu nang » vuc nang, va nang, vu dang
su sach » so sach, vu sach
luc va » duc va, tuc va, loc va
de cau » ke cau, le cau, ve cau
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 (thu sach))) or (su sach)) vu nang x hoi. lieu va cham luc va hanh de cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (su sach)) vu nang x hoi. lieu va cham luc va hanh de cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((tu sach) OR (thu sach))) or (su sach)) vu nang x hoi. lieu va cham luc va hanh de cau tren".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (thu sach))) or (su sach)) vu nang x hoi. lieu va cham luc va hanh de cau tren*.