Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
va danh » va dinh, va dan, va hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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) or (lang xa)) hoi. hieu qua cam xuc ((van hanh) or (va danh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (lang xa)) hoi. hieu qua cam xuc ((van hanh) OR (va danh)) lai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (lang xa)) hoi. hieu qua cam xuc ((van hanh) or (va danh)) lai cua tre*.