Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
tuc van » thuc van, truc van, tuc va
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
va dau » va dao
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: su sach thu nang ma hoi. lieu va dau ((tuc van) or (thuc dan)) hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ma hoi. lieu va dau ((tuc van) OR (thuc dan)) hanh di cuu tre*.