Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi cuu » vi luu, vinh cuu

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) OR (so sach)))) ky nang xa hoi. hieu va cam tuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (so sach)))) ky nang xa hoi. hieu va cam tuc va hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((su sach) OR (so sach)))) ky nang xa hoi. hieu va cam tuc va hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) OR (so sach)))) ky nang xa hoi. hieu va cam tuc va hanh vi cuu tre*.