Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, chat xuc, cac cuoc
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh

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 ky dang xa hoi. hieu van ((cac xuc) OR (cac nuoc)) ((van ban) or (ban hanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu van ((cac xuc) OR (cac nuoc)) ((van ban) OR (ban hanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu van ((cac xuc) OR (cac nuoc)) ((van ban) or (ban hanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu van ((cac xuc) OR (cac nuoc)) ((van ban) or (ban hanh)) vai cua tre*.