Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dai hai » dai han, dai hoi, dai tai
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam
vai va » mai va, hai va, lai va
dai va » mai va

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 hai. hieu ve cam duc va thanh ((vai va) or (dai va)) hieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang dai hai. hieu ve cam duc va thanh ((vai va) OR (dai va)) hieu.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang dai hai. hieu ve cam duc va thanh ((vai va) or (dai va)) hieu*.