Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
thinh le » trinh ly
sach kha » sach nha, sach tham, bach khoa
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach ha » sach nha, sach han, sach xa
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam

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 kha) OR (sach ha)) nang ma hoi. hieu ve cam duc va ((thinh le) or (thanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kha) OR (sach ha)) nang ma hoi. hieu ve cam duc va ((thinh le) OR (thanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kha) OR (sach ha)) nang ma hoi. hieu ve cam duc va ((thinh le) or (thanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach kha) OR (sach ha)) nang ma hoi. hieu ve cam duc va ((thinh le) or (thanh de)) cua tre*.