Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
danh di » danh du, xanh di, danh dien
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
lang ha » long ha
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, duc va
di cuu » di cau, di cua, dinh cuu

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 ky ((nang ma) or (lang ha)) hoi. hieu va chat ((tuc va) OR (tuc xa)) danh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ma) OR (lang ha)) hoi. hieu va chat ((tuc va) OR (tuc xa)) danh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ma) or (lang ha)) hoi. hieu va chat ((tuc va) OR (tuc xa)) danh di cuu tre*".