Perhaps you should try some spelling variations:
nang tai » tang tai, sang tai, nang cao
hang tai » hang va, dung tai
vu sach » vu bach, su sach, vu khach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va hanh, dia danh
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dau

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 tu ((nang tai) OR (hang tai)) roi. hieu ve cam xuc ((va danh) or (va dan)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tu ((nang tai) OR (hang tai)) roi. hieu ve cam xuc ((va danh) OR (va dan)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu ((nang tai) OR (hang tai)) roi. hieu ve cam xuc ((va danh) or (va dan)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach tu ((nang tai) OR (hang tai)) roi. hieu ve cam xuc ((va danh) or (va dan)) vai cua tre*.