Perhaps you should try some spelling variations:
tru nang » tra nang, truc nano, thi nang
danh hai » dang hai, lanh hai, manh hai
tri nang » thi nang, tra nang, tri bang
thuc dan » thuc hanh, thuc vat
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va co » vo co

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 ((tru nang) OR (tri nang)) xa hoi. hieu va co ((thuc dan) or (hoc dan)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tru nang) OR (tri nang)) xa hoi. hieu va co ((thuc dan) OR (hoc dan)) danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tru nang) OR (tri nang)) xa hoi. hieu va co ((thuc dan) or (hoc dan)) danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tru nang) OR (tri nang)) xa hoi. hieu va co ((thuc dan) or (hoc dan)) danh hai cua tre*.