Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van lam » van nam
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
va lam » va lap
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu ((va lam) or (van lam)) thuc vat hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((va lam) OR (van lam)) thuc vat hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((va lam) or (van lam)) thuc vat hanh di cua tre*.