Perhaps you should try some spelling variations:
trinh dinh » trinh kinh, trinh sinh, trinh dung
van trinh » van thinh, van tinh, dan trinh
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cau treo » cau theo, cau triet, cau trieu
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
ve chim » va chim, ve cham, ve chinh
ve chat » va chat, van chat
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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 thu nang o hoc. hieu ((ve chim) or (ve chat)) xuc van trinh dinh ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang o hoc. hieu ((ve chim) OR (ve chat)) xuc van trinh dinh ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang o hoc. hieu ((ve chim) or (ve chat)) xuc van trinh dinh ((cau treo) or (cau tren))*.