Perhaps you should try some spelling variations:
nhan tai » hang tai, van tai, toan tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
han tai » hang tai, van tai, toan tai
xuc van » duc van, luc van, vuc van
va tham » van tham, va thanh, va thuat
va cham » va chat
nang ma » tang ma, sang ma, nang cao
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: su sach ky nang ma hoi. hieu ((va cham) OR (va tham)) xuc van ((han tai) or (nhan tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu ((va cham) OR (va tham)) xuc van ((han tai) OR (nhan tai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu ((va cham) OR (va tham)) xuc van ((han tai) or (nhan tai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu ((va cham) OR (va tham)) xuc van ((han tai) or (nhan tai)) va thiet*.