Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tham xuc » tham nuoc, tham thuc, pham duc
te sach » toc sach
va hanh » va thanh, va danh, ban hanh
sach tu » sach thu, cach tu, sach ty
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu ((nang x) or (lang ha)) hoi. hieu va tham xuc ((va hanh) OR (van hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nang x) OR (lang ha)) hoi. hieu va tham xuc ((va hanh) OR (van hanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nang x) or (lang ha)) hoi. hieu va tham xuc ((va hanh) OR (van hanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nang x) or (lang ha)) hoi. hieu va tham xuc ((va hanh) OR (van hanh)) di cua tre*.