Perhaps you should try some spelling variations:
thanh va » thanh van, hanh va, thanh ha
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 van, dua ban, duc man
va cua » va chua, via cua, ca cua
cua te » cua tu
va cao » va cac, va co, va dao
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((ve cam) or (va cao)) ((duc ban) OR (duc tan)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((ve cam) OR (va cao)) ((duc ban) OR (duc tan)) thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. hieu ((ve cam) or (va cao)) ((duc ban) OR (duc tan)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((ve cam) or (va cao)) ((duc ban) OR (duc tan)) thanh va cua te*.