Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai va
thiet » thieu

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 ky nang ma hoi. hieu va cham ((((xuc van) OR (vuc van))) or (quoc ban)) hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu va cham ((((xuc van) OR (vuc van))) OR (quoc ban)) hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu va cham ((((xuc van) OR (vuc van))) or (quoc ban)) hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu va cham ((((xuc van) OR (vuc van))) or (quoc ban)) hanh vai va thiet*.