Perhaps you should try some spelling variations:
thuc dao » thuc dan, thuc day, chuc dao
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
cau tren » cu tren, dau tren, ca tren
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach ty, sach kem
dao dan » dao van, cao dang, dao dong
dan vai » dan va, dan tai, dan vat
cua tre » cua te, cuu tre, cua triet

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 dao dan vai ((cua tre) or (cau tren))~.
• 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 dao dan vai ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) lang xa hoi. hieu van nam thuc dao dan vai ((cua tre) or (cau tren))*.