Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
cham duc » pham duc, pham duy, phan duc
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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 ly nang ((ma hoi) or (ma hoa)). hieu vu ((cham duc) OR (cham soc)) van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((ma hoi) OR (ma hoa)). hieu vu ((cham duc) OR (cham soc)) van thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang ((ma hoi) or (ma hoa)). hieu vu ((cham duc) OR (cham soc)) van thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((ma hoi) or (ma hoa)). hieu vu ((cham duc) OR (cham soc)) van thanh dai cua tre*.