Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu su » hieu sau, tieu su, hieu so
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
va cua » va chua, via cua, ca cua
cua te » cua tu

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 y ((nang xa) or (lang xa)) hoi. hieu su ((cham duc) or (pham duc)) va tinh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu su ((cham duc) OR (pham duc)) va tinh va cua te.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang xa)) hoi. hieu su ((cham duc) or (pham duc)) va tinh va cua te*.