Perhaps you should try some spelling variations:
chat duc » chat xuc, chat doc, chet duoc
su sach » so sach, vu sach
lang ha » long ha
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu

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 y ((nang x) or (lang ha)) hoi. hieu va chat duc va danh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (lang ha)) hoi. hieu va chat duc va danh vi cuu tre*.