Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (te sach)) y ((lang xa) or (nang ma)) hoi. hieu van cam duc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y ((lang xa) OR (nang ma)) hoi. hieu van cam duc van hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y ((lang xa) or (nang ma)) hoi. hieu van cam duc van hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y ((lang xa) or (nang ma)) hoi. hieu van cam duc van hanh tai cua tre*.