Perhaps you should try some spelling variations:
dap truoc » phap truoc, lam truoc, nam truoc
truoc va » truc va, thuoc va, truong va
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dan doi » dan hoi, dan toi, van doi
doi hoa » doi hoac, doi hoat, do hoa
sac ky » sai ky
va dap » va dao, va dau
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sac ky) or (cac ky)) nang xa hoi. hieu va dap truoc va dan doi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sac ky) OR (cac ky)) nang xa hoi. hieu va dap truoc va dan doi hoa viet.
• Adding a wildcard symbol may retrieve word variants: thuat ((sac ky) or (cac ky)) nang xa hoi. hieu va dap truoc va dan doi hoa viet*.