Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
cua tre » cuu tre, cua triet, dua tren
danh de » hanh de, dan de, dang de
va danh » va dinh, va dan, va hanh
cua suc » cua su, cua duc, cua tuc
qua cua » quan cua, quang cua, qua quan
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
suc va » duc va, tuc va, luc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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) OR (su sach)) ty nang x hoi. hieu qua cua suc va danh de ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu qua cua suc va danh de ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu qua cua suc va danh de ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu qua cua suc va danh de ((cua tre) or (cua te))*.