Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh dong » anh dong, ha dong
dong cua » dung cua, cong cua, huong cua
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » thien van, lieu va, hieu ve
tu sach » su sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma

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) or (thu sach)) ky nang xa hoi. ((hieu van) or (hieu va)) pham thuc va hanh dong cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. ((hieu van) OR (hieu va)) pham thuc va hanh dong cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. ((hieu van) or (hieu va)) pham thuc va hanh dong cua tre*.