Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, thuoc sach, nuoc sach
hanh vai » hanh vi, hanh va, hanh tai
doc sach » hoc sach, nuoc sach, dac sac
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
ve pham » vi pham, v pham, ve phan
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
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) or (((toc sach) or (doc sach)))) ky nang xa hoi. hieu ve pham thuc van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (((toc sach) OR (doc sach)))) ky nang xa hoi. hieu ve pham thuc van hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (((toc sach) or (doc sach)))) ky nang xa hoi. hieu ve pham thuc van hanh vai cua tre*.