Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
xa hanh » xa thanh, xa khanh, va hanh
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
thu xa » thu xac, thu ha, thu xe

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ma hoi. ((hieu va) or (hieu qua)) nam thu xa hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoi. ((hieu va) OR (hieu qua)) nam thu xa hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ma hoi. ((hieu va) or (hieu qua)) nam thu xa hanh tai cuu tre*.