Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
thuc dan » thuc hanh, thuc vat
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tai cuc, tri cua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang x hoi. hieu qua cham ((tuc va) or (((thuc dan) OR (hoc dan)))) dung tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang x hoi. hieu qua cham ((tuc va) OR (((thuc dan) OR (hoc dan)))) dung tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu qua cham ((tuc va) or (((thuc dan) OR (hoc dan)))) dung tai cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu qua cham ((tuc va) or (((thuc dan) OR (hoc dan)))) dung tai cua te*.