Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
toc sach » doc sach, nuoc sach, toc san
hoc sach » hoc sinh, hoc cac, hoc anh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
dan tai » van tai, dan thi, han tai
dan dan » dang dan, ban dan, dao dan
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
buu tre » cuu tre
va nam » van nam, ha nam, va nay

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) or (hoc sach))) or (thuoc sach)) ky lang xa hoi. hieu va nam thuc dan dan tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((toc sach) OR (hoc sach))) OR (thuoc sach)) ky lang xa hoi. hieu va nam thuc dan dan tai buu tre.
• Adding a wildcard symbol may retrieve word variants: ((((toc sach) or (hoc sach))) or (thuoc sach)) ky lang xa hoi. hieu va nam thuc dan dan tai buu tre*.