Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
qua cam » qua cham, qua cac, qua ca
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cuu tre » cua tre, cau tren, cau treo
nang o » nang co, nang ho, nang ro
vi cuu » vi luu, vinh cuu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu nang o hoi. hieu qua cam ((((xuc van) or (thuc vat))) or (duc van)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu nang o hoi. hieu qua cam ((((xuc van) OR (thuc vat))) OR (duc van)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tu nang o hoi. hieu qua cam ((((xuc van) or (thuc vat))) or (duc van)) hanh vi cuu tre*.