Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
thuc va » thuc vat, thuc dan, thuc day
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
dinh vi » dinh ve, dinh viet, dinh tri
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao
tuc va » truc va, tuc xa, duc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky lang xa hoi. hieu va cam ((tuc va) OR (thuc va)) dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky lang xa hoi. hieu va cam ((tuc va) OR (thuc va)) dinh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky lang xa hoi. hieu va cam ((tuc va) OR (thuc va)) dinh vi cua te*".