Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
qua cham » qua hai, qua cac, va cham
vanh dai » van dai, vanh tai, lanh dao
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc 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: thu sach ((ky lang) or (ky tang)) xa hoi. hieu qua cham ((xuc va) OR (luc va)) vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky tang)) xa hoi. hieu qua cham ((xuc va) OR (luc va)) vanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) or (ky tang)) xa hoi. hieu qua cham ((xuc va) OR (luc va)) vanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky tang)) xa hoi. hieu qua cham ((xuc va) OR (luc va)) vanh dai cua te*.