Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
mang mai » mang may, lang mai, mang lai
tu cach » tu cac
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
su tien » su kien, su hien, tu tieng
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky mang » ky nang, ke mang, ky dang
tuc va » thuc va, truc va, tuc xa
ve su » va su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky mang mai hoi. ((hieu ve) OR (hieu va)) cam tuc va thanh ve su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky mang mai hoi. ((hieu ve) OR (hieu va)) cam tuc va thanh ve su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky mang mai hoi. ((hieu ve) OR (hieu va)) cam tuc va thanh ve su tien".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky mang mai hoi. ((hieu ve) OR (hieu va)) cam tuc va thanh ve su tien*.