Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
doi cua » dai cua, hoi cua
thuc xa » thuc xay, tuc xa, thuc va
xa bang » va bang, ba bang, ra bang
ve nam » he nam, va nam, le nam
di cua » dai cua, de cua, do 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) or (thuoc sach)) ky lang xa hoi. hieu ve nam thuc xa bang ((di cua) OR (doi cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky lang xa hoi. hieu ve nam thuc xa bang ((di cua) OR (doi cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuoc sach)) ky lang xa hoi. hieu ve nam thuc xa bang ((di cua) OR (doi cua)) tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky lang xa hoi. hieu ve nam thuc xa bang ((di cua) OR (doi cua)) tu*.