Perhaps you should try some spelling variations:
den thanh » de thanh, dinh thanh, dong thanh
thanh dat » thanh san, thanh hai, thanh van
cham cuu » cap cuu, chat cua
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
cuu den » cuu de, cau den, buu dien
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. ((hieu vu) OR (hieu va)) cham cuu den thanh dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. ((hieu vu) OR (hieu va)) cham cuu den thanh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. ((hieu vu) OR (hieu va)) cham cuu den thanh dat cua tre*.