Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu khach » vu khanh, vu khac, vay khach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
van cac » van hac, van cau, van bac
vu sach » vu bach, su sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
cac tu » cac thu, cach tu, cac du

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ly nang ma hoi. hieu van cac tu va hanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ly nang ma hoi. hieu van cac tu va hanh vi ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ly nang ma hoi. hieu van cac tu va hanh vi ((cua tre) or (cuu tre))*.