Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
ve pham » vi pham, v pham, ve phan
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
bo sach » co sach
cua tre » cua te, cuu tre, cua triet
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: ((((su sach) or (bo sach))) or (hoc sach)) ky nang xa hoi. hieu ve pham thuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (bo sach))) OR (hoc sach)) ky nang xa hoi. hieu ve pham thuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((su sach) or (bo sach))) or (hoc sach)) ky nang xa hoi. hieu ve pham thuc van hanh di cua tre*.