Perhaps you should try some spelling variations:
van tham » van thanh, van tuan, van chat
nhan tai » hang tai, van tai, toan tai
van cham » van chat, va cham, van pham
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri 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: su sach ky nang ma hoi. hieu ((van cham) or (van tham)) ((xuc va) or (tuc va)) nhan tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu ((van cham) OR (van tham)) ((xuc va) OR (tuc va)) nhan tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu ((van cham) or (van tham)) ((xuc va) or (tuc va)) nhan tai va thiet*.