Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » te sach, tu cach, vu sach
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
dai hoa » dai khoa, dai hoc, dai hoi

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