Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
thuc dan » thuc hanh, thuc vat
danh hai » dang hai, lanh hai, manh hai
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
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 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 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 xa hoi. hieu va co ((thuc dan) OR (hoc dan)) danh hai cua tre*.