Perhaps you should try some spelling variations:
sach nham » sach tham, sach han, sach ha
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
nang mai » nang ma, nang tai, lang mai
cam duc » cam xuc, cao duc, nam duoc
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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

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