Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
xa hanh » xa thanh, xa khanh, va hanh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du
di cua » dai cua, doi cua, de cua
tu xa » tu xay, tu va, te xa

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) or (so sach)) y nang ma hoi. ((hieu van) or (thien van)) cac tu xa hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) y nang ma hoi. ((hieu van) OR (thien van)) cac tu xa hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) y nang ma hoi. ((hieu van) or (thien van)) cac tu xa hanh di cua tre*.