Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
cac tu » cac thu, cach tu, cac du
vi cuu » vi luu, vinh cuu
ve cac » va cac, vien cac

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 ((ly nang) or (ly vang)) xa hoi. hieu ve cac tu ((van hanh) or (va thanh)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac tu ((van hanh) OR (va thanh)) vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ly vang)) xa hoi. hieu ve cac tu ((van hanh) or (va thanh)) vi cuu tre*.