Perhaps you should try some spelling variations:
dan viet » danh viet, dang viet, san viet
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang xa » nang x, lang xa, nang ma
sach 2 » sach y
sach v » sach va, sach y, sach vay
soc va » hoc va, loc va, doc va
va dan » ca dan, va dao, va dau
cac te » cac he, cac ke, cac le
cac tu » cac thu, cach tu, cac du

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 v) or (sach 2)) nang xa hoi. hieu va cham soc va dan viet ((cac te) OR (cac tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach v) OR (sach 2)) nang xa hoi. hieu va cham soc va dan viet ((cac te) OR (cac tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) or (sach 2)) nang xa hoi. hieu va cham soc va dan viet ((cac te) OR (cac tu))".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) or (sach 2)) nang xa hoi. hieu va cham soc va dan viet ((cac te) OR (cac tu))*.