Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dai » thanh hai, thanh tai, thanh oai
nuoc van » nuoc va, nuoc san, luoc van
cuu tre » cua tre, cau tren, cau treo
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va hoc » van hoc

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 ky) or (sac ky)) nang xa hoi. hieu va hoc nuoc van ((thanh dai) or (thanh dat)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang xa hoi. hieu va hoc nuoc van ((thanh dai) OR (thanh dat)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang xa hoi. hieu va hoc nuoc van ((thanh dai) or (thanh dat)) cuu tre*.