Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vu kham » vu khanh
ve cham » va cham, ve chat, vu cham
dai moi » doi moi, dai hoi
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
vi va » vi van, vai va, vu va
thiet » thieu

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 ky nang dai moi. hieu ((ve cham) or (vu kham)) ((xuc va) OR (tuc va)) thanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang dai moi. hieu ((ve cham) OR (vu kham)) ((xuc va) OR (tuc va)) thanh vi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang dai moi. hieu ((ve cham) or (vu kham)) ((xuc va) OR (tuc va)) thanh vi va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang dai moi. hieu ((ve cham) or (vu kham)) ((xuc va) OR (tuc va)) thanh vi va thiet*.