Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van ban
cac xuc » cam xuc, cac nuoc, chat xuc
vi nhan » li nhan, va nhan, vi phan
van anh » van thanh, tuan anh, van minh
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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)) y nang mai hoi. hieu ve cac xuc ((van hanh) OR (van anh)) vi nhan thuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. hieu ve cac xuc ((van hanh) OR (van anh)) vi nhan thuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang mai hoi. hieu ve cac xuc ((van hanh) OR (van anh)) vi nhan thuc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. hieu ve cac xuc ((van hanh) OR (van anh)) vi nhan thuc*.