Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, dao viet
nang viet » anh viet
sach ky » sac ky, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
ca truc » cau truc, ca tru, ba truc
truc va » thuc va, thuc vat, trung va
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: thuat ((sach ky) OR (sach y)) tang xa hoi. hieu qua ca truc va ((danh viet) or (nang viet)) cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sach y)) tang xa hoi. hieu qua ca truc va ((danh viet) OR (nang viet)) cac tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sach y)) tang xa hoi. hieu qua ca truc va ((danh viet) or (nang viet)) cac tro".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sach y)) tang xa hoi. hieu qua ca truc va ((danh viet) or (nang viet)) cac tro*.