Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
tuc va » truc va, tuc xa, duc va
vi cua » vai cua, di cua
va dau » va dao

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

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