Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
qua cai » qua hai, qua ca, quan cau
qua cac » cua cac
tuc van » thuc van, truc van, tuc va
cua te » cua tu

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 xa hoi. hieu ((qua cai) or (qua cac)) tuc van hanh vi ((cau tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu ((qua cai) OR (qua cac)) tuc van hanh vi ((cau tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ((qua cai) or (qua cac)) tuc van hanh vi ((cau tren) or (cua te))*.