Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
chau tre » chau tho, cho tre, cau tra
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
hanh va » hang va, hanh vi
ty nang » ky nang, ty xang, ty hang
cac duc » cac du, cao duc, cac dac
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
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 ty nang o hoi. hieu ve cac duc ban hanh va ((chau tre) or (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang o hoi. hieu ve cac duc ban hanh va ((chau tre) OR (chay tren)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang o hoi. hieu ve cac duc ban hanh va ((chau tre) or (chay tren))*.