Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
lang van » dang van, tang van, hoang van
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
vat dan » va dan, van dan, vat ran
cua tre » cua te, cuu tre, cua triet
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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 ty ((lang van) or (van xay)) hoi. thieu quang nam thuc vat dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang van) OR (van xay)) hoi. thieu quang nam thuc vat dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang van) or (van xay)) hoi. thieu quang nam thuc vat dan va cua tre*.