Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
thu xa » thu xac, thu ha, thu ba

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 ky nang ma hoi. hieu van nam ((thu xa) or (thu xe)) ((hanh tai) OR (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu van nam ((thu xa) OR (thu xe)) ((hanh tai) OR (hang tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu van nam ((thu xa) or (thu xe)) ((hanh tai) OR (hang tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu van nam ((thu xa) or (thu xe)) ((hanh tai) OR (hang tai)) cua tre*.