Perhaps you should try some spelling variations:
te sach » toc sach
dan lap » phan lap, dan luan
dan lai » dan loai, dan lat, dan li
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
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: te sach ((ty nang) OR (ty hang)) x hoi. hieu va pham duc va ((dan lai) or (dan lap)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty hang)) x hoi. hieu va pham duc va ((dan lai) OR (dan lap)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ty hang)) x hoi. hieu va pham duc va ((dan lai) or (dan lap)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ty hang)) x hoi. hieu va pham duc va ((dan lai) or (dan lap)) cua tre*.