Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
cua triet » cua viet, su triet, va triet
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
van cua » vang cua, ban cua, dan cua
sac ky » sai ky
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (cac ky)) nang xa hoi. hieu qua cam ((luc va) OR (tuc va)) trinh van cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) nang xa hoi. hieu qua cam ((luc va) OR (tuc va)) trinh van cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (cac ky)) nang xa hoi. hieu qua cam ((luc va) OR (tuc va)) trinh van cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) nang xa hoi. hieu qua cam ((luc va) OR (tuc va)) trinh van cua triet*.