Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
thi van » thi hanh, thi nang
thi lan » thi hanh, thi nang, thi lien
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y lang » o lang, _ lang, tay lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y lang xa hoi. ((thi van) or (thi lan)) nam thuc van hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. ((thi van) OR (thi lan)) nam thuc van hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. ((thi van) or (thi lan)) nam thuc van hanh vi ((cua tre) or (cuu tre))*.