Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
quoc ban » quoc bao, quoc lan, quoc quan
hang tai » hang va, dung 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
xuc van » duc van, luc van, vuc van
han tai » nhan tai, van tai, toan tai
ma hoi » mai hoi, xa hoi, ma hoa
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 van cham ((xuc van) or (quoc ban)) ((han tai) OR (hang tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van cham ((xuc van) OR (quoc ban)) ((han tai) OR (hang tai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu van cham ((xuc van) or (quoc ban)) ((han tai) OR (hang tai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van cham ((xuc van) or (quoc ban)) ((han tai) OR (hang tai)) va thiet*.