Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
tu sach » thu sach, su sach, te sach
van hac » van hoc, van ha, van hai
doi cua » dai cua, hoi cua
va dung » van dung, va duong, vat dung
truc va » thuc va, thuc vat, trung va
dan cac » dan cach, dang cac, dan ca
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((dan cac) or (van hac)) truc va dung doi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((dan cac) OR (van hac)) truc va dung doi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((dan cac) or (van hac)) truc va dung doi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ((dan cac) or (van hac)) truc va dung doi cua te*.