Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, tu cach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
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: ((tu sach) or (te sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky sang ma hoi. ((hieu ve) OR (hieu va)) cam duc va thanh dai cua te*.