Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
danh vai » danh sai, danh va, doanh van
hieu cac » hieu luc, hieu va, hieu van
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
co va » co ma, so va, cu va
do va » do van, so va
bo va » bao va, so va, mo va

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 ty nang xa hoi. hieu hieu cac ((((bo va) or (co va))) or (do va)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu hieu cac ((((bo va) OR (co va))) OR (do va)) danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu hieu cac ((((bo va) or (co va))) or (do va)) danh vai cua tre*.