Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van lang » van nang, va lang, van hang
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
lam tai » lap tai, nam tai, pham tai
tai van » thai van, thi van, tai san
lang ca » lang cua, lang cao, hang ca
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ve lam » va lam, de lam, se lam
ca cuu » cap cuu, cua cuu, ca cua

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 (thu sach)) y nang ma hoa. hieu ve lam tai van lang ca cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang ma hoa. hieu ve lam tai van lang ca cuu tre*.