Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
ky lang » ky dang, tay lang
ky tang » ky dang, kho tang, ky trong
qua hai » qua hoat
hai xuc » hai cuc, hai xu, chat xuc
va vanh » va van, va danh, va hanh
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 ((((ky lang) OR (ky nang))) or (ky tang)) xa hoi. hieu qua hai xuc va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((ky lang) OR (ky nang))) OR (ky tang)) xa hoi. hieu qua hai xuc va vanh dai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((((ky lang) OR (ky nang))) or (ky tang)) xa hoi. hieu qua hai xuc va vanh dai cua te*".