Perhaps you should try some spelling variations:
tan khang » van khang, tao khang, tinh khang
tan hang » ban hang, van hang, gan hang
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
va cam » va cham, va cac, va cao

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 ty ((nang xa) or (nang x)) hoi. lieu va cam duc ((tan hang) OR (tan khang)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. lieu va cam duc ((tan hang) OR (tan khang)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang x)) hoi. lieu va cam duc ((tan hang) OR (tan khang)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. lieu va cam duc ((tan hang) OR (tan khang)) tai cua tre*.