Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hanh va » hanh vi
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
qua cau » quan cau, qua cac, qua cai
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
qua ca » qua cac, qua cua, qua cai

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 ky lang xa hoi. hieu ((qua cau) OR (qua ca)) truc va ((hanh va) or (hang va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ((qua cau) OR (qua ca)) truc va ((hanh va) OR (hang va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu ((qua cau) OR (qua ca)) truc va ((hanh va) or (hang va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ((qua cau) OR (qua ca)) truc va ((hanh va) or (hang va)) cau tren*.