Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh doi » thanh doi, hanh noi, hang doi
doi cua » dai cua, hoi cua
xa hanh » xa thanh, xa khanh, va hanh
cac tuc » cac toc, cac tu, cac tac
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
bo sach » co sach, hoc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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