Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
vanh dai » van dai, vanh tai, van dao
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam cuu » cham cuu, cap cuu
cuu ban » cuu van, cua ban, cuu san
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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 (thu sach)) y nang xa hoi. hieu ve cam cuu ban ((lanh dao) or (vanh dai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve cam cuu ban ((lanh dao) OR (vanh dai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu ve cam cuu ban ((lanh dao) or (vanh dai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang xa hoi. hieu ve cam cuu ban ((lanh dao) or (vanh dai)) cua tre*.