Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
ban thanh » ban hanh, ban hang
gian cua » gian xu, ban cua
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
duc ban » duc tan, duc van, dua ban
cua te » cua tu
va cao » va cac, va co, va dao
ve cam » ve cham, ve cac, va cam
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: su sach ty nang o hoi. hieu ((ve cam) or (va cao)) duc ban thanh gian cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang o hoi. hieu ((ve cam) OR (va cao)) duc ban thanh gian cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang o hoi. hieu ((ve cam) or (va cao)) duc ban thanh gian cua te*.