Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, nam thu, nam tu
dao dong » lao dong, ha dong, bat dong
dong vai » dong tai, dong va, dong vat
sach ky » sac ky, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) or (sach y)) lang xa hoi. hieu van ((nam thuc) OR (am thuc)) dao dong vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) lang xa hoi. hieu van ((nam thuc) OR (am thuc)) dao dong vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach y)) lang xa hoi. hieu van ((nam thuc) OR (am thuc)) dao dong vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) lang xa hoi. hieu van ((nam thuc) OR (am thuc)) dao dong vai cuu tre*.